Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c4c4d5be8296068…

MALICIOUS

PDF

51.2 KB Created: 2020-03-27 08:43:55 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 15e64507303687a4c45a672d7f679655 SHA-1: 90d64ccf51009f9bdae0e0096f5179446aed0a61 SHA-256: 9c4c4d5be8296068a500c3d16c63d20e2575f2f042991eda1824608c258817da
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various PDF files on different domains. The ML classifier also strongly indicated maliciousness. This suggests the document is part of a link farm or SEO manipulation scheme, potentially designed to distribute malware or engage in click fraud. No scripts were extracted, and the document body was heavily obfuscated, but the sheer volume of external links is the primary indicator of malicious intent.

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://morethanjustaface.nl/uploads/1/3/0/2/130288338/130288338.html#acute+confusion+related+to+uti+nursing+diagnosis
    • http://www.designsxcarolina.com/uploads/1/3/0/5/130543264/lonexebuloxus.pdf
    • http://parkshoreplazafolsom.com/uploads/1/3/0/6/130621864/8540767.pdf
    • http://www.roxierosekids.com/uploads/1/3/0/8/130813372/dumejavut.pdf
    • http://fetesetevenementsspeciaux.com/uploads/1/3/0/7/130740151/zanukiguwiteje_zomewogufi_bowarakuveve.pdf
    • http://www.leejeehee.net/uploads/1/3/0/8/130874339/5023250.pdf
    • http://owethu.net/uploads/1/3/0/4/130435905/1847648.pdf
    • http://growinvestmentgroup.com/uploads/1/3/0/8/130814907/jedaz.pdf
    • http://www.perfectcentral.net/uploads/1/3/0/4/130483050/6470254.pdf
    • http://mta-sts.eweaonline.org/uploads/1/3/0/5/130544468/kozoxamuki.pdf
    • http://receptor.host/uploads/1/3/0/5/130550838/8961486.pdf
    • http://lovetrophy.com/uploads/1/3/0/7/130740186/2552742c.pdf
    • http://xn--alpenflge-w9a.com/uploads/1/3/0/5/130588732/kisitiwavi_ronobilod_revelatowenifa.pdf
    • http://www.khmajyanalwaldik.com/uploads/1/3/0/5/130544898/nugulekulu_xisebaxafin_lipilovilimu_mafof.pdf
    • http://photoswithnc.info/uploads/1/3/0/5/130542758/6335836.pdf
    • http://www.custommassageforyou.org/uploads/1/3/0/6/130620720/8829861.pdf
    • http://oiltycoons.com/uploads/1/3/0/5/130540209/0378ed256e9ffd9.pdf
    • http://www.krause0416.com/uploads/1/3/0/8/130814083/84d24ff5c.pdf
    • http://www.stephenburtcounselling.com/uploads/1/3/0/8/130814926/5898480.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_off00009e11.bin
3e49dbd5a4ae91be2e3dfd79a4292ad78a1416f8f38050866e90a3ce64d8803d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9E11 8152 bytes

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