Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5584714f38c106f…

MALICIOUS

PDF

31.1 KB Created: 2020-09-17 12:27:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e25b93f591e5c9982f33f6d46ced8a33 SHA-1: 91b2219d29b7a92219a105c2ba7c92fa56c47397 SHA-256: f5584714f38c106f2ffb42c46cdbe8e7643e74a1938b3280f1ab48fc59b6ce92
174 Risk Score

Malware Insights

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

The PDF file is an image-only document designed as a lure, containing a single clickable link. This link, 'https://ttraff.cc/wix?keyword=pk5501+keypad+manual', redirects to malicious infrastructure. The document also contains a large number of links to other PDFs, likely for SEO manipulation to increase visibility. The ML classifier strongly indicated maliciousness.

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.
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 1 text block(s), carries a click-outward action, and is only 31 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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.cc/wix?keyword=pk5501+keypad+manual
    • https://aa1ccb79-b24b-471b-8760-d221624aeb6d.filesusr.com/ugd/6116da_81175d25e56d424aa83a3486be0ea002.pdf?index=true
    • https://9f11180f-7ccf-4599-a5a9-4964924aa863.filesusr.com/ugd/72ed28_f2c90eb52f7949b7b54f30a0edd6ace3.pdf?index=true
    • https://96e82be5-4f5d-4807-ae4a-1a784e1e9872.filesusr.com/ugd/760101_e509998240aa4ad4b0763de31f273af7.pdf?index=true
    • https://f886fb83-396c-43d4-9dff-6cbfeb9674ba.filesusr.com/ugd/26481d_be9f9321e68a40fa8137f0286ba9fd5b.pdf?index=true
    • https://84dc63cb-9d60-4a45-bf71-81d035a7c172.filesusr.com/ugd/9c66ff_ed9c629234704f9a815c1419a58beb9a.pdf?index=true
    • https://da6aa100-c999-40a5-a731-59f73ca0ae95.filesusr.com/ugd/2b98a3_e75bc50aaee24daba417dccb76d30a30.pdf?index=true
    • https://8fbf34e5-104b-4f80-b18f-b525afa647fc.filesusr.com/ugd/daca0d_dc136961bd884c66978dc97028541f39.pdf?index=true
    • https://2b312a09-a4bd-4db5-b82f-9a6b12b3609c.filesusr.com/ugd/1a89c8_7a3c717a0dfc4f1dae0aab359aee3a54.pdf?index=true
    • https://193be36c-276d-4462-9a3c-2951978203a5.filesusr.com/ugd/9ea91e_66be1cb0efef46599b475fd6847af688.pdf?index=true
    • https://b8ebaca2-6c23-49cd-92f8-2348bbdfa8a7.filesusr.com/ugd/1c8c1e_5a42629f08dc4853bb161b9c8ca381a0.pdf?index=true
    • https://50bce6a9-3779-47d1-8740-8122b2a94a08.filesusr.com/ugd/a86d68_74e8152a5eba470a86ffb7563c41f084.pdf?index=true
    • https://9f293d11-d916-4e5d-8e7a-fe718a1c89c5.filesusr.com/ugd/5899d5_ea74d47b89cd47469fda707b922df159.pdf?index=true
    • https://e30e594e-c8f1-4a46-96c9-91d0f197ea64.filesusr.com/ugd/2c8d66_c6fb1b5294cb4932976c8751fe2279af.pdf?index=true
    • 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_off00004241.bin
3e14c02ac0d8398b9a3bf3237c75f0e1b6467e9e936d6995600f976ffbf35490		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4241 5316 bytes
font_01_sfnt_off0000545e.bin
e61c1f114053c69be3f6f925e9a8eb5947c3ddaf039dc1ee3c7120db9bbd3dd4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x545E 8140 bytes

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