Malicious PDF — malware analysis report

Static analysis result for SHA-256 64c962d7c871d594…

MALICIOUS

PDF

44.8 KB Created: 2020-08-02 22:30:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0916ee58f3d5fbf44a3c9cb8de8b6b90 SHA-1: 1b3deecf50242cb7a5a7ea8732700d48d44eb1f4 SHA-256: 64c962d7c871d5948a643a6de989f1f928194b9cfef9c15bcd1798b194da4b5f
154 Risk Score

Malware Insights

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

The PDF document contains numerous embedded links, with one specifically pointing to a known malicious redirector. The document body, though heavily obfuscated, contains text that appears to be a lure for "Blender tutorials pdf". The ML classifier strongly indicates maliciousness, and the presence of a malicious redirector suggests an attempt to lead the user to a malicious site, likely for phishing or malware distribution.

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=blender+tutorials+pdf
    • http://files.neokymamessinias.org/uploads/1/3/0/7/130738970/tikazan.pdf
    • http://files.franciscosaezsoto.com/uploads/1/3/2/6/132681464/diritudev.pdf
    • http://files.redshirt.org/uploads/1/3/1/1/131164174/tawumatodu_vikagenuzidow_zubuwuz_ragezodu.pdf
    • http://files.davidecerretini.com/uploads/1/3/1/4/131483719/bf6eb5.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/0334/7098/files/22398164690.pdf
    • https://cdn.shopify.com/s/files/1/0435/4339/6506/files/koperusuxi.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/rinavupomun.pdf
    • https://cdn.shopify.com/s/files/1/0438/3087/0173/files/8000122997.pdf
    • https://cdn.shopify.com/s/files/1/0429/3482/9223/files/51513666688.pdf
    • https://cdn.shopify.com/s/files/1/0429/8624/2209/files/87923109896.pdf
    • https://cdn.shopify.com/s/files/1/0431/8402/9854/files/4602358560.pdf
    • https://cdn.shopify.com/s/files/1/0432/4642/0132/files/96084241010.pdf
    • https://cdn.shopify.com/s/files/1/0437/6700/5333/files/48613334384.pdf
    • https://cdn.shopify.com/s/files/1/0438/5135/0166/files/kifanuniderotaragebek.pdf
    • https://cdn.shopify.com/s/files/1/0437/7178/9470/files/75409733206.pdf
    • https://cdn.shopify.com/s/files/1/0429/7123/4467/files/82470478124.pdf
    • https://cdn.shopify.com/s/files/1/0430/7252/0353/files/vagedugoxoma.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_off000071b8.bin
cc83c32e9c4ec5d2d2cc8c6a1051ced14d39e7b0fe27318eb8abc9613d35e427		 pdf-font-stream PDF embedded font (sfnt) at offset 0x71B8 5084 bytes
font_01_sfnt_off00008312.bin
869463f53ba98bcf181cbc18cd71ac4da0d7978c3692d66d2f56898d82a8ba75		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8312 10328 bytes

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