Malicious PDF — malware analysis report

Static analysis result for SHA-256 06c8b43f9748d6a7…

MALICIOUS

PDF

47.5 KB Created: 2020-09-05 04:31:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5903e36a90e9f5bfe603e7a56af974f5 SHA-1: 7c63f5c9560457ce901ee9703479b2e7736aab8a SHA-256: 06c8b43f9748d6a700327995feeee98e58984a0de0b81077009662433f422bd5
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to benign Shopify URLs, but one critical link directs to a known malicious redirector. This suggests a link farm or SEO poisoning tactic to disguise malicious intent. The ML classifier also strongly flagged this PDF as malicious. The embedded URL is presented as a resource for 'collapsing toolbar layout android studio', likely a lure to encourage clicks.

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.link/wix?keyword=collapsing+toolbar+layout+android+studio
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/2603/9463/files/active_listening_communication_skills.pdf
    • https://cdn.shopify.com/s/files/1/0434/7399/3890/files/86950734503.pdf
    • https://cdn.shopify.com/s/files/1/0430/6105/1546/files/vexujodogajivojegurelalax.pdf
    • https://cdn.shopify.com/s/files/1/0431/2717/7380/files/fire_action_notice_sign_template.pdf
    • https://static.usrfiles.com/ugd/4bdc6d_3387df8845d740e8bfdd6041de987ab3.pdf
    • https://static.usrfiles.com/ugd/b8c837_5cd6842a3f7347c39226023b7cdfbb40.pdf
    • https://static.usrfiles.com/ugd/b8c837_8a102dd05cd640c09c166b36a8101432.pdf
    • https://cdn.shopify.com/s/files/1/0435/3359/8880/files/38045333345.pdf
    • https://cdn.shopify.com/s/files/1/0431/8606/1480/files/10493341326.pdf
    • https://cdn.shopify.com/s/files/1/0434/7386/2821/files/vizoxawim.pdf
    • https://cdn.shopify.com/s/files/1/0427/4126/8647/files/screening_for_colon_cancer_guidelines.pdf
    • https://static.usrfiles.com/ugd/1e32c2_28ec32ef6e9741f2a66ad1c0737d9d4c.pdf
    • https://static.usrfiles.com/ugd/362633_2ab1fb90f5a34a0f851fddc2af644d1e.pdf
    • https://static.usrfiles.com/ugd/c068f8_5f9814d84cb14e8788b4d488ff6ff39c.pdf
    • https://static.usrfiles.com/ugd/b8c837_5627618e2fdd494987f63765c99e82ca.pdf
    • https://static.usrfiles.com/ugd/a2de88_9df767d418924a48ba6d891e3fd91600.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_off00007417.bin
4453fae30a492d5ebc58387819e066b118b0b01b81fe68c492aed9bc721377ac		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7417 5276 bytes
font_01_sfnt_off0000860c.bin
5ef8f421f4cd65c73bb57e3a8a882d902b87d5ef10b0386a488edb6c0481bad9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x860C 13464 bytes

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