Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a8862168fd7b022…

MALICIOUS

PDF

35.4 KB Created: 2020-06-03 23:10:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1791fccb1d1ec7fea441a08b945c7c81 SHA-1: dd3cf2b59e6b40c83649cfe75652251091b94308 SHA-256: 9a8862168fd7b022ac2ae53105cad83922e52ba2ff2633668180f01309e9a205
96 Risk Score

Malware Insights

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

The PDF document contains numerous external links, many of which point to PDF files hosted on unrelated domains, suggesting a link farm or SEO poisoning tactic. The document body text explicitly mentions 'modern recording techniques 8th edition free download', which serves as a lure. The presence of a PDF_SEO_LINK_FARM heuristic firing and the ML_NYX_PDF_MALICIOUS flag strongly indicate malicious intent, likely to drive traffic to malicious sites or distribute further malware. No scripts were extracted from this sample.

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://secure-pof.com/uploads/1/3/1/3/131380322/131380322.html#modern+recording+techniques+8th+edition+free+download
    • http://mogreencpa.com/uploads/1/3/0/6/130603676/2314343.pdf
    • http://getjackedtrucking.com/uploads/1/3/0/4/130475964/zugagiposa_zexunoz_temefa.pdf
    • http://bguitarsliuteria.com/uploads/1/3/0/9/130969922/3f8817864b0e.pdf
    • http://shiatsuacademy.org/uploads/1/3/1/6/131636625/5229490.pdf
    • http://thegooroogroup.com/uploads/1/3/0/6/130620841/fipixojajis.pdf
    • http://29u.undesirable.us/uploads/1/3/0/5/130550993/b02d6f8161.pdf
    • http://propertypresentations.net/uploads/1/3/1/4/131437983/wosiwapagat_tiwuzifiburer_fekifipezu.pdf
    • http://melaniebrucks.com/uploads/1/3/0/5/130539940/mivef.pdf
    • http://whittyopinion.com/uploads/1/3/1/4/131453871/koxumexojagizoviwa.pdf
    • http://storyweaverstudio.com/uploads/1/3/0/2/130287283/wodireli.pdf
    • http://moordel.net/uploads/1/3/0/5/130538863/nijibutomot-pejoxukit.pdf
    • http://secure-pof.com/uploads/1/3/1/3/131380322/terms.html
    • http://secure-pof.com/uploads/1/3/1/3/131380322/dmca.html
    • http://secure-pof.com/uploads/1/3/1/3/131380322/policy.html
    • https://pezotagufunu.files.wordpress.com/2020/06/99610797642.pdf
    • https://xivivisep.files.wordpress.com/2020/06/38762555386.pdf
    • https://pawisizepetu.files.wordpress.com/2020/06/85507701683.pdf
    • https://supufusifiv.files.wordpress.com/2020/06/dekexabovuxuxijek.pdf
    • https://jotozagobom540614489.files.wordpress.com/2020/06/rupotilumiki.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_off00005f3c.bin
4bb36d4040cb3449204093ea66e78e5c699ce437d757bb5f1250e408e6bdf560
pdf-font-stream PDF embedded font (sfnt) at offset 0x5F3C 9852 bytes