Malicious PDF — malware analysis report

Static analysis result for SHA-256 76966681fb9f0522…

MALICIOUS

PDF

65.5 KB Created: 2020-10-20 10:30:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: bbd16729ce8083aa77bc6a0708ca1861 SHA-1: 89ade689cff5a09e2b5dffa6c015cab47d6f76ed SHA-256: 76966681fb9f05221b36dae8ba9d5c53cfb2a8f43e3ba7a722e5027dfe76e86f
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link farm designed to redirect users to malicious sites, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK and PDF_SEO_LINK_FARM heuristics. The primary malicious URL identified is https://gettraff.ru/123?keyword=cengage+optics+modern+physics+pdf+download, which is likely part of a phishing or scam campaign. Although no scripts were explicitly extracted, the PDF structure and link farm suggest an attempt to exploit users through deceptive content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://gettraff.ru/123?keyword=cengage+optics+modern+physics+pdf+download In PDF document text
    • https://wepugimi.weebly.com/uploads/1/3/1/0/131070973/kekitogur.pdfIn PDF document text
    • https://mesipaku.weebly.com/uploads/1/3/1/3/131383407/8047517.pdfIn PDF document text
    • https://suludizivot.weebly.com/uploads/1/3/1/3/131383823/4155817.pdfIn PDF document text
    • https://sakuvida.weebly.com/uploads/1/3/0/7/130775714/vidup.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366044/normal_5f87019a52540.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369671/normal_5f892119b1f94.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372960/normal_5f8e0cef719ec.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374715/normal_5f8b76131dc81.pdfIn PDF document text
    • https://noxepelobisuse.weebly.com/uploads/1/3/1/8/131871648/75c593a68.pdfIn PDF document text
    • https://zuparimetusu.weebly.com/uploads/1/3/1/3/131378993/766426.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/7d14ed57-a736-42fb-a27d-5bb9cae1e405/88325974914.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/69ad3ee6-a353-493a-bab1-2938f4205a0f/nevufitilitukudi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/720a6958-ded3-497c-89ee-f6c9ff44e3be/71111064285.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f9085c62-b576-41e5-91d5-23b0b7697310/89990097792.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/08f90a7c-7c82-48ac-8d1a-d325a45629f3/70988397346.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0476/5148/7910/files/ive_been_working_on_the_railroad_meaning.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/1252/1625/files/liuna_local_41.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/2277/6477/files/nilda_junot_diaz.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0488/4080/2469/files/jagojivejixixepexixijatom.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0485/1879/1323/files/sobumuxivopixiru.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8f738be4-d93d-4bf9-81c0-cc292f83b06d/kofabefulobujatufinaw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/13958ffa-2221-4c28-813f-d19028fc67ad/44931466233.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2c1b84d4-8915-487e-b4d4-999d87d1618d/wubalugijevopo.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007c74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7C74 5572 bytes
SHA-256: 5f93497876a3e9becb73f4dcc01c7ff56d7f0b19545f6715be7a48be5cbd5080
font_01_sfnt_off00008f43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8F43 9208 bytes
SHA-256: 10569e717dc7fd2b014155045de69d2c2211692536f829be308d3bf086dbf399
font_02_sfnt_off0000adf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xADF3 10476 bytes
SHA-256: 527f67369d20bde10214eb7af2bd0091b5d9a1df2f7ea5395e945a3a27b15013
font_03_sfnt_off0000d204.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD204 16660 bytes
SHA-256: ad41df0b27e704790f25d6a5a99a1f716fc3ed87c8404e7b021bc666b65bc156
font_04_sfnt_off0000e8b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8B9 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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