Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a8bcaf0570dc4a6…

MALICIOUS

PDF

35.6 KB Created: 2020-05-18 03:18:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2e60d55c53cb5f518c11d9c2915a0b2c SHA-1: efbbfc8c8ac5eeeb2d26808b3d177ac0a77e4e82 SHA-256: 3a8bcaf0570dc4a632891ae4098a162ccf9f1b08f376ce0cc5fcac23c3b810b6
94 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to other PDF files on different domains. This pattern is indicative of SEO poisoning or a link farm designed to distribute malicious content or drive traffic. The ML classifier strongly supports the malicious verdict. No scripts were extracted, and the document body is heavily obfuscated, but the presence of numerous external links is the primary indicator of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://rinseygroupllc.com/uploads/1/3/1/4/131453494/131453494.html#until+dawn+100+trophy+guide
    • http://inthedoghousetreats.com/uploads/1/3/0/6/130621751/8994234.pdf
    • http://jzsmartlife.com/uploads/1/3/1/6/131637271/nidenakapizatobef.pdf
    • http://centerlinenj.com/uploads/1/3/1/6/131637161/fc27022a5.pdf
    • http://aboutchelsea.org/uploads/1/3/1/3/131378975/895053982.pdf
    • http://safetygradelicensure.org/uploads/1/3/1/4/131453276/lesewixapulodo.pdf
    • http://bluebirchgoods.com/uploads/1/3/0/6/130604562/vagexofilovore.pdf
    • http://deercoveresort.com/uploads/1/3/0/6/130604147/barane-lilojigaxekom-gerevejawuwo.pdf
    • http://whereustand.net/uploads/1/3/0/4/130483498/kafazinoje.pdf
    • http://cristinazorrilla.com/uploads/1/3/1/4/131454114/bubapugomego.pdf
    • http://pigeongaming.net/uploads/1/3/0/4/130483086/poteleveruguwig.pdf
    • http://hairbynicolewasserman.com/uploads/1/3/0/4/130477566/1123605.pdf
    • http://mynastybath.com/uploads/1/3/0/6/130620991/15b07ee40.pdf
    • http://missinguniversemuseum.org/uploads/1/3/1/0/131070722/8671785.pdf
    • http://hammerpropertyinspections.com/uploads/1/3/0/3/130323293/dobijugubukapulivej.pdf
    • http://female-eye.com/uploads/1/3/1/8/131871993/vumavipep.pdf
    • http://mzphysics.com/uploads/1/3/0/8/130813146/5428093.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_off00005f26.bin
5142b205fdeeafe90e91368ca69a23efeaefe7ca1ab52674d9525b776f78ce7b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F26 10532 bytes

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