Malicious PDF — malware analysis report

Static analysis result for SHA-256 004c00d36b5d3ae8…

MALICIOUS

PDF

41.3 KB Created: 2020-09-18 06:23:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 134278c0be0a9169f38a9c9aba879ec0 SHA-1: 30e1e375a112100961b385cef4e31d0095e7e811 SHA-256: 004c00d36b5d3ae83ff42150e0dfb995f7551962120f30e47b9ee7f9a4734802
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a malicious redirector link disguised as a worksheet answer key, designed to lure users to a malicious site. The ML classifier strongly flagged this PDF, and heuristics indicate it's part of a link farm, likely for SEO poisoning or driving traffic to malicious content. The presence of a callback lure heuristic suggests a potential for further social engineering or phishing attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns
  • 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.club/wix?keyword=structure+of+the+atom+worksheet+answers+section+1
    • http://wubul.jostenmyburgh.com/uploads/1/3/1/4/131438188/9956b7d.pdf
    • http://files.immortalinquiry.com/uploads/1/3/0/8/130813516/pebupo_rokiposefuta_wemax_pasegepimonel.pdf
    • http://roxadusi.beatlesnow.com/uploads/1/3/1/6/131636725/b6f9a520fe9.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://2bf199d9-72f5-4eca-9191-c8e8e8a7199c.filesusr.com/ugd/e1d12c_fc2f2630078d42b087afa1d7cebdddbc.pdf?index=true
    • https://6e8c98c5-66cb-4079-b96d-4fb05596901a.filesusr.com/ugd/0049ca_29d3091e193247dba2ee65ea7e017278.pdf?index=true
    • https://f65e3a97-bfd6-41cb-88ee-2a8475674817.filesusr.com/ugd/3eed2b_23dbee70f07246ab9dafad8ca52687f7.pdf?index=true
    • https://5393e7e0-3467-4b9b-bb18-c4c96e0963d2.filesusr.com/ugd/2f3216_7de5cdccf5e44c92a83e9faea810495a.pdf?index=true
    • https://1007eb89-752e-4ba8-957f-8f9f089c1749.filesusr.com/ugd/7a359d_d5cde854f5354180a86263442f3d7a2c.pdf?index=true
    • https://cdn.shopify.com/s/files/1/0437/2388/2664/files/1230440689.pdf
    • https://cdn.shopify.com/s/files/1/0431/8344/0030/files/nolasul.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_off00006265.bin
5962166407176aaff64ff0202df6ed6650f69fbdbb238899a897be633c2a2ce9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6265 5400 bytes
font_01_sfnt_off000074b3.bin
c9aa396602f77c19986d64f36a0faaa3c69fe11a4e0267cad46ddb6bd5e74683		 pdf-font-stream PDF embedded font (sfnt) at offset 0x74B3 10504 bytes

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