Malicious PDF — malware analysis report

Static analysis result for SHA-256 a894ff7f945aef42…

MALICIOUS

PDF

37.4 KB Created: 2020-06-17 08:16:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 06a6d060a850bd3f5dda10c6668fff56 SHA-1: f02a0418912ae50442c86b1ee5875fa2b4d778f1 SHA-256: a894ff7f945aef429d7ad0e5abe3c617b025fe6c25517827f57dfd1d4fc5be12
92 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF document employs a lure by claiming to be a PDF editor, while embedding a large number of external links. These links point to other PDF files hosted on various domains, suggesting a link farm or redirection mechanism. The ML classifier strongly indicated maliciousness, and the PDF_SEO_LINK_FARM heuristic confirms the presence of numerous external links designed to appear as search engine results. No scripts were extracted, but the extensive link farm indicates a likely attempt to drive traffic or distribute further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 3

  • 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
  • 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://vpgrou.brdge.org/uploads/1/3/1/3/131380725/131380725.html#the+best+pdf+editor
    • http://vida-florida.org/uploads/1/3/1/6/131606588/9614713.pdf
    • http://msksjewelryboutique.com/uploads/1/3/0/7/130775545/4e3f0e1a40.pdf
    • http://kampuslandinc.com/uploads/1/3/1/3/131383352/peviwevuwatini.pdf
    • http://allimaccomputers.com/uploads/1/3/0/5/130589337/dcc935c.pdf
    • http://general1948.com/uploads/1/3/1/3/131383383/1453577.pdf
    • http://icgpainting.com/uploads/1/3/1/4/131438216/zenesalu_nutevoz_mugakotanaxobi.pdf
    • http://maumahara.co.nz/uploads/1/3/0/7/130740264/kokibopabunab_jolojuzoru_sezakilevoxu_biwezodukolafu.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_off00005654.bin
294da8d88045585592a80586a6816c7b05b705b9111c034e120c40537fae3c80		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5654 4660 bytes
font_01_sfnt_off00006635.bin
839156e1f7e9f3ec754bceff033aee3bdf9c293fae111ac420c43235a77acf77		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6635 10112 bytes

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