Malicious PDF — malware analysis report

Static analysis result for SHA-256 60fc0b12b14fa698…

MALICIOUS

PDF

40.4 KB Created: 2020-04-08 00:39:07 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: a042cc39965ebdde9d42f313f1ba2c75 SHA-1: 82adb14db633b5d7083b2caf26374062c44e7479 SHA-256: 60fc0b12b14fa698fb4ce6e565bad347a8a74e7d83156c2c920e3f1da1983247
96 Risk Score

Malware Insights

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

The PDF contains a large number of embedded external links, a technique often used for SEO spam or to redirect users to malicious sites. The ML classifier strongly indicated maliciousness, and the PDF_SEO_LINK_FARM heuristic confirms the presence of a link farm. While no scripts were explicitly extracted, the embedded links are the primary indicators of malicious intent, likely leading to further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://ladonastork.com/uploads/1/3/1/4/131438538/131438538.html#new+york+liberty+roster+2017
    • http://solsticedevelopment.org/uploads/1/3/1/4/131413418/wuxomezuki_pamal_noranezitoli.pdf
    • http://goldencacahouetes.com/uploads/1/3/0/5/130550867/pirumekesudone.pdf
    • http://drumeffect.com/uploads/1/3/1/0/131070382/946327a7a0601.pdf
    • http://photosbyhuddy.com/uploads/1/3/0/5/130550976/nifefaninijuzovabos.pdf
    • http://tordownstorage.com/uploads/1/3/0/4/130477018/dutepizifijekatufo.pdf
    • http://newyorkpercussiongroup.com/uploads/1/3/0/9/130969446/zafolinidamiliz.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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/
    • https://fedoraproject.org/wiki/Licensing/LiberationFontLicense

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006b29.bin
45d9b30c0dcb12089f7294e6aece872f0651685b985fe6b88e4c9eaa3191a61c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6B29 8220 bytes
font_01_sfnt_off00008b16.bin
7863b829de04ea8b7f5be4d5dae43fa62182e7611f0c3a300d10b316d27db496		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8B16 2732 bytes

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