Malicious PDF — malware analysis report

Static analysis result for SHA-256 4377852d4e32801a…

MALICIOUS

PDF

33.6 KB Created: 2020-05-31 17:18:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: eeb9d94dd9e85288e47ff10ecd26f510 SHA-1: 243e5b1542cc9ccf23df6f4a9341aaf669e4a545 SHA-256: 4377852d4e32801a5c3b696dd0fd24acf9315c97d2423ee3b03a07c38e3ab5cb
94 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to WordPress domains, suggesting a link farm or SEO poisoning tactic. The primary external URL, http://bratertechnologyservice.com/uploads/1/3/0/5/130551066/130551066.html#marvel+collector+cards+price+guide, is presented within the document body and appears to be a lure related to collector cards. The ML classifier strongly flagged this PDF as malicious, and the PDF_SEO_LINK_FARM heuristic indicates a suspicious pattern of link distribution.

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 http://bratertechnologyservice.com/uploads/1/3/0/5/130551066/130551066.html#marvel+collector+cards+price+guide
    • https://maturixox.files.wordpress.com/2020/05/wajolarozifafo.pdf
    • https://zolukid.files.wordpress.com/2020/05/42199899656.pdf
    • https://duzawexosusa.files.wordpress.com/2020/05/17379041188.pdf
    • https://pamivibafime.files.wordpress.com/2020/05/40690963657.pdf
    • https://duwopizemole.files.wordpress.com/2020/05/tanubuluxugatipa.pdf
    • https://guzubuxokom.files.wordpress.com/2020/05/vureraxudikigepegikokulas.pdf
    • https://zidokuwit42107594.files.wordpress.com/2020/05/zisebinibunapunosut.pdf
    • https://daritawaba.files.wordpress.com/2020/05/76475214532.pdf
    • https://xilejabugagu.files.wordpress.com/2020/05/kanevitudavozaj.pdf
    • https://mokelim.files.wordpress.com/2020/05/83891132506.pdf
    • https://xibelilunaf.files.wordpress.com/2020/05/58416971317.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 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005954.bin
8b843176fc5373ef62a08350b2ab95a66663f7207b3e8363763729b66f633666		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5954 9800 bytes

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