Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bd14ea4a5313a1b…

MALICIOUS

PDF

33.4 KB Created: 2020-08-29 05:47:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 82c232b438d1f0260042062cf1d1cce6 SHA-1: e6f3e56490e7139bc6845aac6a12ad57809af56e SHA-256: 5bd14ea4a5313a1bb9e25c869074bd4f87c78d9964fcf3f2c31b9bba2869bf82
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link to a known malicious redirector, ttraff.cc, which is disguised as a 'grass cutter user manual'. This heuristic, combined with the ML classifier's high confidence, indicates a malicious intent to redirect the user to harmful content. The document also contains a large number of external PDF links, suggesting a link farm or SEO manipulation tactic to distribute malicious content.

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.cc/wix?keyword=grass+cutter+user+manual
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/b8c837_54eadc46311c449e81892e972544e22d.pdf
    • https://static.usrfiles.com/ugd/b8c837_b7dca886703f4e22bb7de47499a5230c.pdf
    • https://static.usrfiles.com/ugd/b8c837_5f40be5bc94947249c1abfbd6357f31e.pdf
    • https://static.usrfiles.com/ugd/b8c837_b51c96207ff748869eea4b0dcbe50a33.pdf
    • https://static.usrfiles.com/ugd/b8c837_1a56a2e8c17b4000b26c132eab328a95.pdf
    • https://cdn.shopify.com/s/files/1/0435/4310/1591/files/information_systems_computer_applications_clep.pdf
    • https://cdn.shopify.com/s/files/1/0430/0262/6202/files/xidaniwuvijofenumapemo.pdf
    • https://cdn.shopify.com/s/files/1/0429/8804/4447/files/vojajiponetilujasojowor.pdf
    • https://cdn.shopify.com/s/files/1/0432/6447/5299/files/64317703872.pdf
    • https://cdn.shopify.com/s/files/1/0438/4158/5314/files/yaseen_shareef_read_online.pdf
    • https://cdn.shopify.com/s/files/1/0433/5868/3291/files/49479228690.pdf
    • https://cdn.shopify.com/s/files/1/0431/3609/0273/files/action_research_in_english_reading_comprehension.pdf
    • https://cdn.shopify.com/s/files/1/0432/3698/2943/files/building_construction_book_download.pdf
    • https://cdn.shopify.com/s/files/1/0461/3216/6824/files/free_printable_division_worksheets_grade_3.pdf
    • https://cdn.shopify.com/s/files/1/0462/5730/7797/files/new_infection_control_guidelines_2019.pdf
    • https://cdn.shopify.com/s/files/1/0434/3175/5932/files/64081815302.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_off00004757.bin
f6801ebbfa023ceb715daa64ac2e12a9a7d3f4c417947f2836b3866f99b90fa8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4757 4976 bytes
font_01_sfnt_off0000582a.bin
9714bae606e106fd7464b57f3bfae3782338559ca3449a9baa87fd535007e6cf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x582A 9648 bytes

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