Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bc727bb988524f6…

MALICIOUS

PDF

51.3 KB Created: 2020-09-07 01:20:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 74590b73d033a5dc3fc906dcaf10b596 SHA-1: 9f7e87c1598b1d38b98800b0c6ba2ac610b82435 SHA-256: 5bc727bb988524f6a417dc908951ac832385ab36a7613a18496bf5dab3637293
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure, specifically pointing to 'ttraff.club'. The document body, though heavily obfuscated, contains the URL 'https://ttraff.club/wix?keyword=alight+motion+pro+2.+4.+3', suggesting a lure for software downloads. The presence of numerous other PDF links, many pointing to 'usrfiles.com', indicates a link farm strategy to potentially obscure the malicious destination.

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.club/wix?keyword=alight+motion+pro+2.+4.+3
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/5cf23b_7539a13a913c440f99e1047f942c5779.pdf
    • https://static.usrfiles.com/ugd/516574_089f7566d5794695b293c8e2bef43382.pdf
    • https://static.usrfiles.com/ugd/6924eb_31bf341c84e14cc78431e4ef8ac4940a.pdf
    • https://static.usrfiles.com/ugd/d2b720_9ea9223332884e1a9aed73d51e44d8e0.pdf
    • https://static.usrfiles.com/ugd/c7ef1a_6033445fa90d44b6b833e0c416d5299f.pdf
    • https://cdn.shopify.com/s/files/1/0433/7742/6584/files/68485230463.pdf
    • https://cdn.shopify.com/s/files/1/0433/5517/7109/files/lose_weight_workout_plan.pdf
    • https://cdn.shopify.com/s/files/1/0437/7552/5022/files/be_in_charge_of_crossword_answer.pdf
    • https://static.usrfiles.com/ugd/7dd30d_81c432d3ff1f421ab14e2d0d7b34e05e.pdf
    • https://static.usrfiles.com/ugd/b80405_2c4738186b944401bdb71d45c698719d.pdf
    • https://static.usrfiles.com/ugd/6cfc61_e18fd5b64caf48bdb756a9f2bbfb9596.pdf
    • https://static.usrfiles.com/ugd/99965f_76989b02374742ef8796a4372273870f.pdf
    • https://static.usrfiles.com/ugd/b8c837_335e42b09e474ea6aae944e6a41eac6f.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007370.bin
8ab2fae581351be7da64765d8d327e7ed2603ae57a4cc5ed778ca3e5988c512b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7370 5252 bytes
font_01_sfnt_off00008535.bin
614ccd7ce01c9555a51d2ba526bd647535a71feaa1a662afb25b5109c4402eff		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8535 10780 bytes
font_02_sfnt_off0000aa05.bin
a8f82ce1cdc57d6cf73caeb35ba0a534b8f114798d4dfc5d6ed82df03316e49d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAA05 16384 bytes

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