Malicious PDF — malware analysis report

Static analysis result for SHA-256 51dae3a576acb1e7…

MALICIOUS

PDF

34.5 KB Created: 2020-05-15 04:09:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: db16b488f2833639bfa10af7c80c5903 SHA-1: a140241cc0362052877731b955c7b7785c0eb9b2 SHA-256: 51dae3a576acb1e79e0095211e840a133781a551cd90354db7bc643408ad191c
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various domains. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains references to URLs that are consistent with the link farm heuristic. The primary attack pattern appears to be a link farm designed to manipulate search engine results or distribute further malicious content via the numerous linked PDFs.

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://brad9052.com/uploads/1/3/0/2/130271153/130271153.html#dmv+driver+test+guide
    • http://edmontonbrokerageproposal.com/uploads/1/3/1/4/131453610/508d5.pdf
    • http://asianflushninja.com/uploads/1/3/0/3/130379299/denuziwowo.pdf
    • http://modelsandobs.com/uploads/1/3/0/6/130605380/babipuvexiveg.pdf
    • http://colorshortfilm.com/uploads/1/3/0/2/130289417/tazozed_menogubaxiwugi_begug_zufomeguzat.pdf
    • http://webdesign-templates.nl/uploads/1/3/0/2/130271214/071f8994834b72.pdf
    • http://the-lifestyle-storey.com/uploads/1/3/1/4/131483588/7339d4.pdf
    • http://kassandracomplex.com/uploads/1/3/0/5/130550993/mezezujunivivi.pdf
    • http://jayballad.com/uploads/1/3/0/4/130489650/d5cfb9da90e7.pdf
    • http://westernenergy-rd.com/uploads/1/3/0/5/130551004/6087523.pdf
    • http://beautifulcreationshair.com/uploads/1/3/0/5/130550833/295f612860a.pdf
    • http://coffeesalad.com/uploads/1/3/0/6/130621511/zagudunugerulut_zelejatet_fuxifef.pdf
    • http://campaignartwork.com/uploads/1/3/1/0/131069860/2805975.pdf
    • http://monahanmedia.net/uploads/1/3/0/2/130272880/tumaniv-fivimekufug-vegujufupabuj.pdf
    • http://spirit1design.com/uploads/1/3/0/5/130543656/556e049.pdf
    • http://womenofthewordibs.com/uploads/1/3/1/8/131858353/rifenajewikapijuz.pdf
    • http://thequincychronicles.com/uploads/1/3/0/6/130639616/6d8a01c23c37047.pdf
    • http://melanieandco.com/uploads/1/3/1/4/131407406/78bfe.pdf
    • http://faithsouthwest.org/uploads/1/3/1/4/131453350/degelowu-kuxalasejebe.pdf
    • http://ateliertattoo.com/uploads/1/3/0/2/130272575/tedut-zujivadakeg-xokuponupugime.pdf
    • http://campbeltownhighlandgames.com/uploads/1/3/0/7/130739778/9829673.pdf
    • http://createinutah.studio/uploads/1/3/0/5/130538996/fokesowugewedadapon.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_off00005d34.bin
202b4e82fdcbc5dad2e1dab20a23fc79ff61f056f543fe2b0c3c597d54fb2341
pdf-font-stream PDF embedded font (sfnt) at offset 0x5D34 9664 bytes