Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b80e469c142cef9…

MALICIOUS

PDF

48.7 KB Created: 2020-03-29 05:44:27 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 67c56c4bb51cf8147c79128cca19e003 SHA-1: f549b5b360bd14b96c7c719a9da3a34805730dc0 SHA-256: 6b80e469c142cef97fa94201506e87d70b9abdb01f868dc5508cd0b88d3b54da
96 Risk Score

Malware Insights

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

The PDF document contains numerous embedded links to external websites, identified as a link farm. The document body, though partially corrupted, suggests a lure related to a crossword puzzle. The primary attack pattern involves directing users to a network of SEO-optimized PDF links, likely for malicious redirection or content distribution. No scripts were extracted, but the extensive use of external links points to a malicious intent to lead users away from the current document.

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://zambiasafarihunting.com/uploads/1/3/1/4/131408256/131408256.html#crucigrama+de+ortografia+pdf
    • http://tkbent.com/uploads/1/3/0/5/130590682/993facae.pdf
    • http://74-123-79-55.mgwnet.com/uploads/1/3/0/9/130969985/1626434.pdf
    • http://thebishopteam.net/uploads/1/3/0/5/130543979/c2870.pdf
    • http://mrshalford.com/uploads/1/3/0/5/130589044/9809376.pdf
    • http://grammarassn.org/uploads/1/3/0/7/130740462/mesejemumaf.pdf
    • http://circumchange.ca/uploads/1/3/0/2/130291040/3156c10dd0.pdf
    • http://jessrledd.com/uploads/1/3/0/2/130289410/dexasitaxivogu-tokiwarob-banupizex-ditokanaxidazi.pdf
    • http://brittanyhassandesigns.com/uploads/1/3/0/9/130969277/c4fc542943.pdf
    • http://californiahydrogenwater.com/uploads/1/3/0/5/130590082/c31df6fcd.pdf
    • http://mykwalk.com/uploads/1/3/0/3/130324004/2333760.pdf
    • http://chongai520.com/uploads/1/3/0/7/130775700/bakodaxiven_basazivake.pdf
    • http://dcrestaurantgroup.com/uploads/1/3/0/7/130739704/944c15adf108b7.pdf
    • http://chefpapinyc.com/uploads/1/3/0/5/130540021/b0e7bcdb58.pdf
    • http://miatstarr.com/uploads/1/3/0/7/130739267/sunujo_ritetav_fimedeg_gitewedulola.pdf
    • http://retired.blue/uploads/1/3/0/4/130488669/6810516.pdf
    • http://ahemartcollective.com/uploads/1/3/0/6/130604869/6033796.pdf
    • http://stockholmweekender.com/uploads/1/3/0/4/130488100/xanuwa-dezotefujuset.pdf
    • http://punkrockdeals.com/uploads/1/3/0/5/130551132/panep-letotijolikupub-jadanikojeke.pdf
    • http://www.ahistoryofno.com/uploads/1/3/0/4/130483617/dusero.pdf
    • http://theaterworx.info/uploads/1/3/0/6/130605292/9716392.pdf
    • http://dk-jackson.com/uploads/1/3/0/6/130604202/24806bcc2.pdf
    • http://planetsubtexas.com/uploads/1/3/0/2/130272892/jiredomateg.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/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000072c4.bin
3c8a31c94e9fc30648b43bd62efffd6960cda1ed5428d07ba9c0852ff852db61		 pdf-font-stream PDF embedded font (sfnt) at offset 0x72C4 9248 bytes
font_01_sfnt_off000093c3.bin
a1600c79331cba21b3b4a1f056a9d989f02b1280d9db796053b5096bff0b23f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x93C3 2000 bytes
font_02_sfnt_off00009d30.bin
101447ec0f1ff9a166538e0d663148276e3a4fc1aded7589db46e8db93931e1f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9D30 16336 bytes

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