Malicious PDF — malware analysis report

Static analysis result for SHA-256 b790bf0d935787c0…

MALICIOUS

PDF

45.6 KB Created: 2020-11-08 21:17:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: d1629ba3892a5af4b8f075c35eddcd9a SHA-1: 10d14db5b212d25056f92525a8ff46a6c9cd2b06 SHA-256: b790bf0d935787c0e841f6d6dce7bc532037c123df0e1293799e767f70806a50
136 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file contains numerous external links, with a primary redirector URL pointing to 'https://traffset.ru/123?keyword=cosmetic+damage+car'. The document body, though heavily obfuscated, includes this URL and other S3 bucket links, suggesting a link farm or SEO poisoning tactic to lure victims. The ML classifier strongly flagged this PDF as malicious, indicating a high likelihood of it being used for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://traffset.ru/123?keyword=cosmetic+damage+car PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4372960/normal_5f8a71267bfd1.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://s3.amazonaws.com/kezemiradigu/wudup.pdfIn PDF document text
    • https://s3.amazonaws.com/betimugi/polearm_master_great_weapon_master.pdfIn PDF document text
    • https://s3.amazonaws.com/sefipa/cot_sheets_amazon.pdfIn PDF document text
    • https://nonoxogudege.files.wordpress.com/2020/11/77223613237.pdfIn PDF document text
    • https://s3.amazonaws.com/tetazino/ambedkar_books_in_marathi.pdfIn PDF document text
    • https://s3.amazonaws.com/zasepo/90134950758.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/338ad428-1103-4ccf-b16e-27e2775992ff/gikosuzosupef.pdfIn PDF document text
    • https://s3.amazonaws.com/susopuzupure/86844502738.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bbc19f29-f6ad-4cab-8a86-946c171c79b0/mercedes_2010_c350.pdfIn PDF document text
    • https://s3.amazonaws.com/xutomoxu/jojakogud.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bb7b0c99-2c51-428f-aa39-446a9c1e7ff2/neogeo_rom_pack_retropie.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

Related samples 4

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000676d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x676D 4932 bytes
SHA-256: 4d15d20aef27a6e99a34ca35fe2bb7203b80cea14af1be62a93afaf63459cc03
font_01_sfnt_off00007839.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7839 10348 bytes
SHA-256: 40c765d2632854c9a28f98ae3dc66067f1fb62c4a98e9e5d0a74c759d507e65c
font_02_sfnt_off00009b60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9B60 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230

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