Malicious PDF — malware analysis report

Static analysis result for SHA-256 6cac8ddacb81cfc6…

MALICIOUS

PDF

45.6 KB Created: 2020-10-02 05:36:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 2e9591508d92a8ac7aeb30f1626f2f2b SHA-1: 9d66f2a83a1885e66bc56d8f208effe9cc42ffa3 SHA-256: 6cac8ddacb81cfc6903222eb8e0f99bed5711147951f54ade83b84d37bca23b9
184 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with one identified as a malicious redirector. The ML classifier also flagged this PDF as malicious. The document body, though heavily obfuscated, contains URLs that are part of a link farm, suggesting an attempt to manipulate search engine results or lure users to malicious sites.

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/strik?keyword=napoleon+hill+think+and+grow+rich+13 In PDF document text
    • http://gabosepax.prairiefieldshoa.com/uploads/1/3/1/3/131380600/rafubajono.pdfIn PDF document text
    • http://fisali.studiohdancecompany.com/uploads/1/3/1/3/131378942/aafa27afb1c.pdfIn PDF document text
    • http://ketuz.mybusinesswhy.com/uploads/1/3/0/9/130969744/8bddc.pdfIn PDF document text
    • http://files.hoodarc.org/uploads/1/3/0/7/130776110/2787286.pdfIn PDF document text
    • http://files.royackerskennels.com/uploads/1/3/0/7/130775557/a491673.pdfIn PDF document text
    • http://josawarus.bridgnorthbikers.com/uploads/1/3/1/3/131382243/rosupo.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/8af8dba0-fcd7-4ffa-b7d5-7101d5d875f1/pepukemumufulesoja.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/645e033f-2b47-49b8-8a17-e584468fac73/92299150881.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1632ef0d-d869-4473-b2ff-c0b44b5bce87/nejugonibadukepomoveteram.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e1b957e3-c9ff-444e-a0fa-317a0c621efa/pemirawa.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/4016/1435/files/cow_puns_reddit.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/0703/9912/files/adobe_audition_cc_2015_crack.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/3193/2311/files/gut_balance_revolution_companion.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/5391/6053/files/54714405816.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_off000073fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x73FD 5500 bytes
SHA-256: 77fe3215cd6ab93e75dd3930e82a8d8c264af233e39d5f3faca2d783c4fc6e9b
font_01_sfnt_off000086cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x86CD 10176 bytes
SHA-256: 88d9208c06b42dfca71d1ff9232a2d46dbe81dc355ba93a88d58ff76f82ca6ee

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