Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f8436d871058250…

MALICIOUS

PDF

44.3 KB Created: 2020-11-09 06:39:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: fa66e3fcc249765a242caf9a80a31acc SHA-1: 7c6aa8e4a45b12a6fba860c401417d43ce1e7250 SHA-256: 6f8436d87105825003ac00e90ec48236319cab7a2ddb1a7869f6fcd05c83b7e6
96 Risk Score

Malware Insights

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

The sample is a PDF document that contains a large number of external links, identified as a PDF link farm. The primary URL, 'https://trafftec.ru/123?keyword=pokemon+sun+and+moon+episode+75', suggests a lure related to popular media, likely to attract clicks. The ML classifier strongly indicates maliciousness, and the presence of numerous external links points towards a distribution or SEO manipulation tactic.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://trafftec.ru/123?keyword=pokemon+sun+and+moon+episode+75 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4444100/normal_5fa6d5e53a6bf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379842/normal_5f951c53ea366.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379732/normal_5f8d616c5d5b1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367302/normal_5f8762d9950c5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383794/normal_5fa3c2635fe6a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393186/normal_5f90b264bb321.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385869/normal_5f8dfbea7c036.pdfIn PDF document text
    • https://tijaworiluwulu.weebly.com/uploads/1/3/4/3/134363233/d87992d2ceda.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377400/normal_5f8e3e7ee23db.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/10b59bf9-849d-4095-b1a6-c0d5d1165b5f/99528796844.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0ee92654-e512-4792-8ecc-a77e476bb4c4/47650008197.pdfIn PDF document text
    • https://mepugen.files.wordpress.com/2020/11/65967984453.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/64a3d4a3-d5e2-4458-86dd-b9e4d846dbe0/82571632166.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5c64c871-5dae-4036-abff-4328b560ba8a/98081264737.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6d7100ba-5bbe-4ed9-9537-21667a7d8138/bozedodululoti.pdfIn PDF document text
    • https://wisofira.files.wordpress.com/2020/11/rajediwefefa.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_off00006d1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6D1D 5248 bytes
SHA-256: 32ce5606d234f6c57e719d1274a893113658a71917280d95231e0cef7c29503a
font_01_sfnt_off00007ef9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7EF9 10592 bytes
SHA-256: 70a8b001e5c7ae2695112f17cf5612c64d87351c3c7212bfd5ccafe83d254a96

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