Malicious PDF — malware analysis report

Static analysis result for SHA-256 600dec1065f7ac4b…

MALICIOUS

PDF

34.8 KB Created: 2020-05-20 17:42:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 37be552f7a7eaed7bf33b9ca5db1375e SHA-1: 24866725364cd1a1d881e42ba8e3e158e179969e SHA-256: 600dec1065f7ac4b9871ae72cc9c466080fcba16493662f4db3c45bf7707df38
96 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which are numerically or generically named, suggesting a link farm designed to manipulate search engine results. The document body itself contains text related to software serial numbers, likely a lure to encourage clicks on these links. The ML classifier strongly indicated maliciousness, and the heuristic firings confirm the presence of a link farm.

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://mrrick.net/uploads/1/3/0/9/130969735/130969735.html#adobe+audition+cs6+serial+numbers
    • http://mylittlemutant.com/uploads/1/3/0/5/130551417/4496461.pdf
    • http://music4am.com/uploads/1/3/0/6/130603916/zusorogaw.pdf
    • http://dynamixtrainingsolutions.com/uploads/1/3/0/4/130483552/264d448e3e0d2.pdf
    • http://papermyworld.com/uploads/1/3/0/5/130588617/mitoterexozupipobef.pdf
    • http://danbetophotography.com/uploads/1/3/0/4/130489564/fe22008cc45.pdf
    • http://ayearofadventures.com/uploads/1/3/0/6/130620710/5030738.pdf
    • http://towneeastauto.com/uploads/1/3/0/8/130813992/e0c3879c0575.pdf
    • http://surberlaw.org/uploads/1/3/0/7/130775922/a20ec.pdf
    • http://thequickenloanspartnership.com/uploads/1/3/1/3/131381946/gagiwifofe_miwenafur.pdf
    • http://fs-hardscaping.com/uploads/1/3/1/8/131860378/kejew.pdf
    • http://pixieinkdesign.com/uploads/1/3/0/4/130492441/7673982.pdf
    • http://walserforcommissioner.com/uploads/1/3/0/5/130590665/mepajezezab.pdf
    • http://sesasiacom.com/uploads/1/3/1/6/131637149/segafimudoduzo.pdf
    • http://anxietyblog.info/uploads/1/3/1/4/131409841/dakalafedire-dadamatoje-nutuwosipel.pdf
    • http://elaneducation.org/uploads/1/3/0/2/130287278/widimoke.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005c9b.bin
46aa7fa2f870679a93506ceea59caa85d5de334bf1a5c3ef2c5e2949c16a6039		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5C9B 10332 bytes

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