Malicious PDF — malware analysis report

Static analysis result for SHA-256 caacb622e3fff3db…

MALICIOUS

PDF

59.2 KB Created: 2020-10-16 00:18:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: f01935c7b1488ae4489ac2cad74d87f9 SHA-1: de4fc9b8c027c7a8f13705c6542427934d66b1fb SHA-256: caacb622e3fff3db7aa323cb695110b9ce6568580165331e9d532d4c9f2cb010
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains numerous embedded links, with at least one pointing to known malicious redirector infrastructure. The heuristic firings indicate it's part of a link farm, likely designed to manipulate search engine results or distribute malware. The ML classifier strongly supports its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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://cctraff.ru/123?keyword=decision+theory+definition+pdf In PDF document text
    • https://jawowigo.weebly.com/uploads/1/3/0/7/130774982/87a3a3e4.pdfIn PDF document text
    • https://zesopupejilit.weebly.com/uploads/1/3/0/7/130738861/7266703.pdfIn PDF document text
    • https://fulipevaxavu.weebly.com/uploads/1/3/2/6/132695351/80362e9c7c.pdfIn PDF document text
    • https://zafozudakajadev.weebly.com/uploads/1/3/0/8/130814863/b628c54eef4e3.pdfIn PDF document text
    • https://zuxuzesis.weebly.com/uploads/1/3/1/4/131438019/854c3d193b527.pdfIn PDF document text
    • https://site-1042346.mozfiles.com/files/1042346/kazutipofinoz.pdfIn PDF document text
    • https://site-1039895.mozfiles.com/files/1039895/zesunasesajeratoluluwo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/4d8d58a0-0819-4bf6-99cb-39c67781293d/raxasakap.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3e060a25-66d1-4d59-aa5e-f71693510eef/tiborenusaj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3140c495-f616-4bbb-bba5-9eb2451f0b60/sefaketoxemi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0500/2500/5206/files/dafitukebedatukabawon.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0501/8334/0192/files/58379082486.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/7279/6325/files/14774643032.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0494/5553/0151/files/dear_america_letters_home_from_vietnam_answers.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0498/7810/6270/files/codium_fragile_ssp._tomentosoides.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0459/3159/3895/files/34298589071.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/3960/0021/files/kujanejajakolobovonufebe.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/4902/0311/files/bill_of_rights_scenarios_worksheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/083afe82-c205-406c-9a87-ab5ff2ed6198/sanipubosevedi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/531fcaef-65ad-4dac-86dd-3b2c80396d56/kesinon.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e09e5c2d-9440-4b70-bd45-268aa6fb53c1/nufirokerivukituvo.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ab44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAB44 5104 bytes
SHA-256: ef853ca26f2c4b258c4d34effaf942970e3b192fb5e737c026b87c2f4146bc6b
font_01_sfnt_off0000bca0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCA0 10284 bytes
SHA-256: 8852912ea082d16a7d3e3355021b6eb955055ff3236a655c544296cf962327d0