Malicious PDF — malware analysis report

Static analysis result for SHA-256 6fdc7eb3af56eeaf…

MALICIOUS

PDF

47.6 KB Created: 2020-07-24 08:49:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a78f55a150f5d1095fe33492be789de8 SHA-1: d5835d4bfb70178086ae9fd3cd711ab423c2b1ab SHA-256: 6fdc7eb3af56eeafc5fadd90e587126aa415f90bd46d8294b10da8e8e3df5771
154 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to what appears to be a link farm designed for SEO manipulation. One prominent link redirects to a malicious infrastructure, suggesting an attempt to drive traffic to harmful sites. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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 https://ttraff.ru/pify?keyword=bass+guitar+string+buyers+guide
    • http://files.indacreations.com/uploads/1/3/1/3/131383651/kowomuk-borodimatiw-vunavusozu-pipupokati.pdf
    • http://files.woundandwisdom.me/uploads/1/3/1/6/131606694/8087268.pdf
    • http://files.philippinemasonry.org/uploads/1/3/1/3/131382243/5374648.pdf
    • http://files.marlousdesigns.com/uploads/1/3/0/8/130814021/b278ff391af6.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/5442/3464/files/buvadekix.pdf
    • https://cdn.shopify.com/s/files/1/0430/4296/3613/files/15347239290.pdf
    • https://cdn.shopify.com/s/files/1/0430/2936/4889/files/61130330991.pdf
    • https://cdn.shopify.com/s/files/1/0429/7529/7689/files/67218866015.pdf
    • https://cdn.shopify.com/s/files/1/0429/7365/9290/files/93409307757.pdf
    • https://cdn.shopify.com/s/files/1/0431/3281/3469/files/51825762447.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/metiliwetizo.pdf
    • https://cdn.shopify.com/s/files/1/0430/1471/7597/files/56673219945.pdf
    • https://cdn.shopify.com/s/files/1/0431/4506/8699/files/21884084963.pdf
    • https://cdn.shopify.com/s/files/1/0435/4569/0266/files/97549508565.pdf
    • https://cdn.shopify.com/s/files/1/0433/0346/9206/files/nonawobifoket.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/69262577592.pdf
    • https://cdn.shopify.com/s/files/1/0436/0221/5074/files/80103890173.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007e71.bin
ef4d59792d941137160d1798af0ac1331bdc7d71e7f8b0d82f0e4023f2927f4e
pdf-font-stream PDF embedded font (sfnt) at offset 0x7E71 5024 bytes
font_01_sfnt_off00008f8c.bin
e930a067da8df3d98ad7d93e7436c4165959d8408f074f4afec7815f6e562f42
pdf-font-stream PDF embedded font (sfnt) at offset 0x8F8C 9872 bytes