Malicious PDF — malware analysis report

Static analysis result for SHA-256 b911cf7e33074a7f…

MALICIOUS

PDF

46.7 KB Created: 2020-08-02 16:08:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e75667c6b60666195b6b96eaf55cedb7 SHA-1: fd6e8a48c00ae78353663d3d3cb69da7c5f7b85a SHA-256: b911cf7e33074a7fce0ed40ef1aeede26b746c02aaa7376088212431d1412383
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'ttraff.ru'. The document body and embedded URLs indicate a lure related to software activation keys, specifically for Movavi Video Converter. The PDF also exhibits characteristics of a link farm, with numerous embedded links, many hosted on Shopify, likely for SEO manipulation to increase visibility. The ML classifier strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • 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://ttraff.ru/pify?keyword=movavi+video+converter+activation+key
    • http://files.alfredspace.com/uploads/1/3/1/4/131437711/nibuvematejisifiw.pdf
    • http://files.priorityenvironmental.ca/uploads/1/3/2/7/132740415/poturowinu-pepurefeme-zomoxiru.pdf
    • http://files.villasundream.com/uploads/1/3/1/4/131407274/d3da800d4984f5.pdf
    • https://cdn.shopify.com/s/files/1/0439/1724/6632/files/nesonoxogekaxideralogoru.pdf
    • https://cdn.shopify.com/s/files/1/0429/8267/0485/files/xanoxezuve.pdf
    • https://cdn.shopify.com/s/files/1/0433/4521/5637/files/wapiwuviwadubaro.pdf
    • https://cdn.shopify.com/s/files/1/0436/3635/9326/files/23069828037.pdf
    • https://cdn.shopify.com/s/files/1/0432/3953/8851/files/85525984791.pdf
    • https://cdn.shopify.com/s/files/1/0433/0392/7973/files/xogaxuwikexiluvevofuse.pdf
    • https://cdn.shopify.com/s/files/1/0434/0423/0805/files/refiner_s_fire_lyrics.pdf
    • https://cdn.shopify.com/s/files/1/0432/5320/3102/files/movafufovisekiboxewo.pdf
    • https://cdn.shopify.com/s/files/1/0430/8546/3713/files/94167597621.pdf
    • https://cdn.shopify.com/s/files/1/0436/4717/2768/files/disokogotudesulibi.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/44484222312.pdf
    • https://cdn.shopify.com/s/files/1/0437/2201/4870/files/11458232835.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/wexidemunuviviradepinitim.pdf
    • https://cdn.shopify.com/s/files/1/0441/3269/6216/files/50631333872.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007842.bin
9805929a6aa963a86a62854cf4b5ca5a97deb0279cfa7af6b4f6c48e841358d5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7842 4952 bytes
font_01_sfnt_off0000894b.bin
4102d337c8e82ecdfd05b0d338ab7ea65b484b2f882067d8ddd0895c565d8775		 pdf-font-stream PDF embedded font (sfnt) at offset 0x894B 10620 bytes

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