Malicious PDF — malware analysis report

Static analysis result for SHA-256 8de849faf4903cf1…

MALICIOUS

PDF

45.8 KB Created: 2020-08-29 07:02:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 154a35598c7422906efbded1fea2f02f SHA-1: f879689b7a276a5672538e766c102e0e5cf024e1 SHA-256: 8de849faf4903cf1ace1abfe4c53df3f1882f409b381d9a18fab44b84a9a1093
152 Risk Score

Malware Insights

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

This PDF was generated by wkhtmltopdf and contains a large number of embedded links. One link points to a known malicious redirector, while many others point to external PDF files hosted on static.usrfiles.com and cdn.shopify.com. This suggests a link farm or SEO poisoning attack, potentially designed to drive traffic to malicious sites or improve their search engine ranking. No scripts were extracted, and the document body is heavily obfuscated.

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.com/wix?keyword=tim+ferriss+pavel+deadlift
    • https://static.usrfiles.com/ugd/b8c837_d8c36b70ffb34682ad727a0ea84269f1.pdf
    • https://static.usrfiles.com/ugd/b8c837_e8388d73db444d69a14b93bc18b36f80.pdf
    • https://static.usrfiles.com/ugd/b8c837_3279adcd308141108f647b98d0b30610.pdf
    • https://static.usrfiles.com/ugd/b8c837_1dca233853b44c6e80c6aa52ceec16bc.pdf
    • https://static.usrfiles.com/ugd/b8c837_0e2117e68b004dbc897498a972b48566.pdf
    • https://cdn.shopify.com/s/files/1/0433/4141/4552/files/filupanigikokoxod.pdf
    • https://cdn.shopify.com/s/files/1/0448/4779/2290/files/48971648666.pdf
    • https://cdn.shopify.com/s/files/1/0429/8244/1113/files/wubozudukuwigisatolak.pdf
    • https://cdn.shopify.com/s/files/1/0435/5689/6920/files/6391625168.pdf
    • https://static.usrfiles.com/ugd/b8c837_c2cdf11cf77d41e495478a8651f93925.pdf
    • https://static.usrfiles.com/ugd/b8c837_a96b52027037426995c4055e1696a306.pdf
    • https://static.usrfiles.com/ugd/b8c837_4bf3d8c6071a45e3a927d926aac3c04e.pdf
    • https://static.usrfiles.com/ugd/b8c837_3714812553ec4230806e50afae7fd171.pdf
    • https://static.usrfiles.com/ugd/b8c837_62e9944362b448d381a9bce733d3be2d.pdf
    • https://static.usrfiles.com/ugd/b8c837_d99d9feb1f144681b9db795ef12f9348.pdf
    • https://static.usrfiles.com/ugd/b8c837_61a8fd9d557f4068bb5e783080b20db6.pdf
    • https://static.usrfiles.com/ugd/b8c837_f989ac2ba76d4abba6e204ea626b5b00.pdf
    • https://static.usrfiles.com/ugd/b8c837_9aa162c10aa24028865f40f68157fe9e.pdf
    • https://static.usrfiles.com/ugd/b8c837_350ed67898fa49bc8ca490459bc7a8c9.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_off0000747c.bin
64ecfc0e27be884e2a5d24d7146a5b74430ef8b8e9e27e331b4d8ed2b42c7522		 pdf-font-stream PDF embedded font (sfnt) at offset 0x747C 5196 bytes
font_01_sfnt_off00008612.bin
3e50c631be40f1df3bc604dda9e1b943ef158f3810454b71b8198f9b97c6ff6e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8612 10844 bytes

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