Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b3865bfc163925e…

MALICIOUS

PDF

77.5 KB Created: 2021-01-08 15:23:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 625d5afdb87eb46085967d123da248b9 SHA-1: de1dc13ab057c2889db1d7d79098d565b98ba264 SHA-256: 6b3865bfc163925ec0f50e46891c1c53c173a7f8a5a22cde20f136d25852f5e4
104 Risk Score

Malware Insights

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

The PDF document contains a significant number of external links, identified as a link farm, suggesting a malicious intent to redirect users to potentially harmful content. The ML classifier strongly indicated maliciousness, and the presence of embedded URLs further supports this assessment. While no scripts were explicitly extracted, the PDF structure and link farm heuristic point towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/aws?utm_term=happy+wheels+3d++pc+free PDF link annotation
    • https://cdn.sqhk.co/pasepizut/gjPhd9i/advance_auto_parts_coupon_30_percent_off.pdfIn PDF document text
    • https://cdn.sqhk.co/nivodoruw/iihibhj/playstation_app_not_working_on_ps3_2018.pdfIn PDF document text
    • https://pitajuzijos.weebly.com/uploads/1/3/4/8/134885257/ruponadudivujem.pdfIn PDF document text
    • https://cdn.sqhk.co/jarebomu/F3jhshh/12573439490.pdfIn PDF document text
    • https://jupawipomilat.weebly.com/uploads/1/3/2/7/132741176/zogelodimebizelok.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421209/normal_5ff346687acb9.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/2ab303a2-9c7f-4518-b09c-6e0e3f3bfbf4/32683538995.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d823f58d-d21e-4491-8243-2e95e3606e9c/1672819873.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/034891d0-a3b7-430e-b2a7-a89d9bae2523/tagalog_praise_and_worship_songs_with_lyrics_2019.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/049ec86e-c0e6-405d-b8d5-fc6ba3c8fc7c/sasunutajinazaso.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/923b8ec7-bdee-4960-86dd-9dbaf8bcfe18/91953487728.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/50f531c8-ea86-4e1f-9797-784e68067587/bfs_vs_dfs_python.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e48e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE48E 5008 bytes
SHA-256: 8533039ed38559a16bd4d60f3bcc437acd989ed1db2aa8026cc0b8f54697fc2d
font_01_sfnt_off0000f5b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5B4 11348 bytes
SHA-256: e618a6d4b6de3f53b06e42ca27c624e4f9653c401ec49ef80e5a309a87b2dd69
font_02_sfnt_off00011b56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B56 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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