Malicious PDF — malware analysis report

Static analysis result for SHA-256 84d7eaeee95b69ea…

MALICIOUS

PDF

40.9 KB Created: 2020-06-03 12:57:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cb7729324c284ee0c834a915591afaf9 SHA-1: 7a80abda2f3daa8ac4b21fc7e3a4190d2c3e2540 SHA-256: 84d7eaeee95b69ea5dacebb0a9caa7be1e5d9cf3c9f0bde8fa80ade6a7e73f1d
94 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to domains that appear to be part of a link farm. The heuristic PDF_SEO_LINK_FARM specifically identifies this pattern, suggesting the document's primary purpose is to redirect users to these external sites. The ML classifier also strongly indicated maliciousness. No scripts were extracted, and the document body is heavily obfuscated, but the presence of numerous SEO-linked PDFs points towards a traffic redirection or click fraud scheme.

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://findmeahomeutah.com/uploads/1/3/0/8/130813922/130813922.html#willy+beaman+massy+arias
    • http://hamburghouse.org/uploads/1/3/1/6/131606815/60d2d913d1f110.pdf
    • http://fresht33.org/uploads/1/3/0/8/130814676/zorenanijo.pdf
    • http://gdjhandymanservice.com/uploads/1/3/1/0/131070173/1d54454238983d.pdf
    • http://postmaster.semprefesta.org/uploads/1/3/0/5/130540359/jetodozojodobaleloja.pdf
    • http://journeymentalhealth.org/uploads/1/3/0/7/130739557/beweguzobuli_gakavileta_fimik.pdf
    • http://bestrealestateagentinbatonrouge.com/uploads/1/3/0/2/130287942/136d0c41af4f5.pdf
    • http://bavarian-opera-academy.com/uploads/1/3/0/8/130814176/mupogexunetiko.pdf
    • http://findmeahomeutah.com/uploads/1/3/0/8/130813922/terms.html
    • http://findmeahomeutah.com/uploads/1/3/0/8/130813922/dmca.html
    • http://findmeahomeutah.com/uploads/1/3/0/8/130813922/policy.html
    • https://letajesuki.files.wordpress.com/2020/05/lisodonuruk.pdf
    • https://xafolepid.files.wordpress.com/2020/05/16448696186.pdf
    • https://zuzelerebola.files.wordpress.com/2020/05/mupinameru.pdf
    • https://tedinunimo.files.wordpress.com/2020/05/wulono.pdf
    • https://falizoxofamo.files.wordpress.com/2020/05/daken.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000683b.bin
74a1099cd07443dfb30e0e9bd0a81a4ce4fec07e8df9cb7a57342143aebddc11
pdf-font-stream PDF embedded font (sfnt) at offset 0x683B 2456 bytes
font_01_sfnt_off000071d3.bin
19adf96af05a4997dd6912e2814223a6eb936c22cc74f5bb3a9bc015b43f7d72
pdf-font-stream PDF embedded font (sfnt) at offset 0x71D3 11156 bytes