Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c8eaff259111660…

MALICIOUS

PDF

50.1 KB Created: 2020-04-10 21:15:25 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: e90f359c1313f94a19ba9214e0f877f0 SHA-1: 86c1a44ac720d573cd6e6fe8d693b9364e21fb56 SHA-256: 7c8eaff259111660f48f859c34154af94da1e71b32d5e3973feb34d0e5df9310
104 Risk Score

Malware Insights

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

The PDF contains numerous external links, identified as a link farm, and a specific lure related to 'drivers ed module 8 test answers'. The ML classifier strongly flagged this PDF as malicious. The presence of many external links suggests the document is designed to redirect users to potentially malicious websites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://doubleeagleadvisers.com/uploads/1/3/0/2/130273776/130273776.html#drivers+ed+module+8+test+answers
    • http://shacklebusters.net/uploads/1/3/0/8/130874426/losamitetidegow_rezasa_vanuk_nonovufifovotip.pdf
    • http://thelovesound.com/uploads/1/3/0/5/130589160/3136902.pdf
    • http://shiftoakland.org/uploads/1/3/0/6/130639668/1259646.pdf
    • http://promotoprint.com/uploads/1/3/1/0/131070983/10fdbef64bf.pdf
    • http://infiniteendsbrand.com/uploads/1/3/0/8/130814250/2347207.pdf
    • http://angelicaannoh.com/uploads/1/3/0/6/130639626/bazok.pdf
    • http://northerntravelandevents.com/uploads/1/3/1/6/131636702/0b971.pdf
    • http://ohanarootzwear.com/uploads/1/3/0/6/130621385/tigolipaxesevo.pdf
    • http://umsegundoantesdevocemorrer.net/uploads/1/3/0/5/130539188/6413815.pdf
    • http://rachelehirsch.com/uploads/1/3/0/7/130740489/neleneluxozetifumo.pdf
    • http://bestwaxbali.com/uploads/1/3/1/4/131408056/tabefojoketog-tekipafune-dosimi-tutawum.pdf
    • http://beyondessentialsbybren.com/uploads/1/3/0/4/130483394/3100512.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_off000099f6.bin
97b4844048208c84850580167d808e2d94680be988041e0fc926a8e795e4aba4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x99F6 9232 bytes

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