Malicious PDF — malware analysis report

Static analysis result for SHA-256 fce3f4f6582e9fe3…

MALICIOUS

PDF

42.4 KB Created: 2020-03-20 01:43:09 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 160c5be5b0badc0b77fefcba77d8451a SHA-1: d47e8f588b5a621db3dfb41ed5eadd03aeda8e71 SHA-256: fce3f4f6582e9fe3772850c7b0e99884a77a270721732c1412356dc637b54abf
94 Risk Score

Malware Insights

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

The PDF document is identified as malicious by an ML classifier and exhibits characteristics of a link farm, embedding numerous external URLs. The document body, though partially corrupted, contains a lure related to 'Call of Cthulhu Metallica lyrics' and references the wkhtmltopdf tool, suggesting it was generated programmatically. The primary attack pattern involves redirecting users to a network of SEO-optimized PDF links, likely for malicious distribution or traffic generation.

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://hepburnhideaway.com/uploads/1/3/0/5/130588480/130588480.html#call+of+cthulhu+metallica+lyrics
    • http://mingalarfoods.com/uploads/1/3/0/2/130272905/2157519.pdf
    • http://cephproject.org/uploads/1/3/0/4/130488152/pipidek.pdf
    • http://alchemiventures.com/uploads/1/3/0/3/130323526/01031226.pdf
    • http://multilanguagebox.com/uploads/1/3/0/6/130620395/lorereduzid.pdf
    • http://deinma.net/uploads/1/3/0/7/130776138/kizeju_finulavowazi_nukefezadaxu_zizijikoke.pdf
    • http://bewrite.org/uploads/1/3/0/8/130815582/3869903.pdf
    • http://alaskacharr.org/uploads/1/3/0/5/130590653/8637838.pdf
    • http://hostmaster.roxanakbeauty.co.uk/uploads/1/3/0/2/130271076/6746296.pdf
    • http://professionalwildlifeguide.com/uploads/1/3/0/6/130605016/tezozin.pdf
    • http://massageforthemasses.com/uploads/1/3/0/3/130379435/5943547.pdf
    • http://mrcmuskogeerevivalcenter.org/uploads/1/3/0/2/130288559/446707.pdf
    • http://imolas-workshop.com/uploads/1/3/0/7/130739996/dasivabufu-bijopumonotobon.pdf
    • http://athyrowingandcanoeing.com/uploads/1/3/1/1/131163740/c17d79ed93.pdf
    • http://nmswrites.com/uploads/1/3/0/7/130740537/jugawi_kewom_fevabosazo_gebesusum.pdf
    • http://thefullflavour.com/uploads/1/3/0/3/130323120/gilelofirilu.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_off00007bca.bin
efcad6e21af83e7ad900c297fde135d5140a4aa76ea05e49188c8ca334568f78		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7BCA 8576 bytes

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