Malicious PDF — malware analysis report

Static analysis result for SHA-256 3aff624422496b18…

MALICIOUS

PDF

41.2 KB Created: 2020-04-06 10:05:22 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 350bc21145569e1b18e5a8036443d3d1 SHA-1: f21dfa8a9acf55096b1aaf108a2c2820b873249b SHA-256: 3aff624422496b180e1e56064b0adb43766207aab0a6969fb8f32c860481e93b
94 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell

The PDF file exhibits characteristics of a link farm, containing a large number of external URLs pointing to other PDF files. This technique is often used for SEO manipulation or to distribute malicious content. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a harmful intent. No scripts were extracted, limiting the ability to determine specific payload delivery mechanisms.

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://tourprogolf.org/uploads/1/3/0/7/130776068/130776068.html#plantronics+backbeat+go+810+review
    • http://anchoragesolutionsinc.com/uploads/1/3/0/6/130639972/ketitexupiwadaf-daruxub-fifuxome.pdf
    • http://reliablerealty.org/uploads/1/3/0/7/130738991/4a3abac45e259.pdf
    • http://smorfiaworld.com/uploads/1/3/0/5/130551517/mavuvapix-dupuzelepex.pdf
    • http://lkjhospitalityandevents.com/uploads/1/3/1/0/131070043/loxexajov.pdf
    • http://906vapor.com/uploads/1/3/0/7/130775832/d5d2c27a532.pdf
    • http://funky-fibers.com/uploads/1/3/0/6/130604144/gonutokifez_wulus.pdf
    • http://brigj.com/uploads/1/3/0/6/130639764/fumujemozagu.pdf
    • http://michael-pollard.com/uploads/1/3/0/5/130551925/c1ebc2f6.pdf
    • http://kichaksepticservice.com/uploads/1/3/0/7/130739312/8350363.pdf
    • http://madelinepuccioni.com/uploads/1/3/0/9/130968934/savepavetax.pdf
    • http://samsonrchobbyshop.com/uploads/1/3/0/2/130288532/vaxuwodugo-lizinepadesuzu-nijef.pdf
    • http://lovercosmetics.com/uploads/1/3/0/7/130738921/fekifikeminuman-zotexetagowofe-welet-xogexova.pdf
    • http://patchoblue.com/uploads/1/3/0/6/130604354/4228714.pdf
    • http://valepontelo.com/uploads/1/3/0/2/130289570/biripebosa.pdf
    • http://car-gocarriers.com/uploads/1/3/0/7/130740597/8737061.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_off000078ae.bin
abb8edec30f2976d6331ebf7eb9fd8d289f5b51d577dc53ace9687e3543afe9d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x78AE 7948 bytes

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