Malicious PDF — malware analysis report

Static analysis result for SHA-256 6681ed1471b93f19…

MALICIOUS

PDF

57.6 KB Created: 2020-06-04 05:43:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 09f2c1f97b9a7cb338600716749639b2 SHA-1: 058016e4677b06cb8f1d553e8d75790ade74c594 SHA-256: 6681ed1471b93f19ee640b099ae4c7952b81c96afb86f2b98adc671ff2d35231
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are dynamically generated and point to potentially malicious content. The document body references 'Skyrim executioner armor', likely a lure to entice users to click on the embedded links. The ML classifier strongly indicates maliciousness, and the heuristic firings confirm the presence of a link farm designed to host malicious content.

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://smg.mx/uploads/1/3/0/2/130291475/130291475.html#skyrim+executioner+armor
    • http://kayeandlyndon.com/uploads/1/3/0/2/130270993/pilexofowelisu-bulis-samuwe-gelinu.pdf
    • http://lineageexecutive.com/uploads/1/3/1/0/131071295/vojupokorubewu.pdf
    • http://yourlogisticpartner.com/uploads/1/3/1/3/131380052/9959925.pdf
    • http://greenareaconsulting.net/uploads/1/3/0/8/130814914/mumufuwoxuzabofozim.pdf
    • http://hostmaster.thehandycornershop.co.uk/uploads/1/3/0/7/130776367/59ccfef7be498.pdf
    • http://sfsecure.com/uploads/1/3/0/5/130590219/ragakosononu_letev.pdf
    • http://boilerbustersri.com/uploads/1/3/0/5/130543107/xonuromiwezi.pdf
    • http://theprofessionalmother.org/uploads/1/3/1/3/131380901/rigipo.pdf
    • http://smg.mx/uploads/1/3/0/2/130291475/terms.html
    • http://smg.mx/uploads/1/3/0/2/130291475/dmca.html
    • http://smg.mx/uploads/1/3/0/2/130291475/policy.html
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://sofajot.files.wordpress.com/2020/06/lojolaputizafofakedo.pdf
    • https://fagaxopamite.files.wordpress.com/2020/06/88078710413.pdf
    • https://jukavazak949774331.files.wordpress.com/2020/06/tuzulor.pdf
    • https://debidipevod.files.wordpress.com/2020/06/sibebopij.pdf
    • https://levejaru304222751.files.wordpress.com/2020/06/6200151658.pdf
    • https://nanesufated.files.wordpress.com/2020/06/71945061391.pdf
    • https://bakesigoru.files.wordpress.com/2020/06/fojajo.pdf
    • https://pixafir.files.wordpress.com/2020/06/faxej.pdf
    • https://mivofasasune176129009.files.wordpress.com/2020/06/7676240055.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://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b48d.bin
c12fefe8c8946e14d325753350c8c8979e91918ecfc1ea9edf21ca2aced539d3
pdf-font-stream PDF embedded font (sfnt) at offset 0xB48D 11080 bytes