Malicious PDF — malware analysis report

Static analysis result for SHA-256 44e25f7a3a531ad4…

MALICIOUS

PDF

39.6 KB Created: 2020-09-04 14:29:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1a6f0c8839c9755a0954eed61a1bc5c6 SHA-1: f32f40a64dff46a6547e0c1e5a24ab3c519c89b7 SHA-256: 44e25f7a3a531ad4c6a258243f0e03146083eb57725bc114430edb896b5d550c
152 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by an ML classifier and contains a critical heuristic indicating it links to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains the URL 'https://ttraff.link/wix?keyword=coordinate+plane+graphing+worksheets', which is the primary indicator of malicious intent. The presence of a large number of external PDF links, many hosted on Shopify, suggests a link farm or SEO poisoning tactic to distribute the 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.link/wix?keyword=coordinate+plane+graphing+worksheets
    • https://cdn.shopify.com/s/files/1/0431/5886/4028/files/xowikulenevamulabafev.pdf
    • https://cdn.shopify.com/s/files/1/0434/0632/7975/files/approach_to_dizziness.pdf
    • https://cdn.shopify.com/s/files/1/0431/8140/8420/files/contoocook_river_fishing_report.pdf
    • https://cdn.shopify.com/s/files/1/0437/3017/4113/files/86868440688.pdf
    • https://cdn.shopify.com/s/files/1/0433/6828/4319/files/les_4_accords_toltques.pdf
    • https://cdn.shopify.com/s/files/1/0437/1437/9930/files/script_to_send_email_from_gmail.pdf
    • https://cdn.shopify.com/s/files/1/0429/5314/6517/files/gastric_sleeve_recipes.pdf
    • https://cdn.shopify.com/s/files/1/0431/7904/9121/files/62975803716.pdf
    • https://cdn.shopify.com/s/files/1/0427/8570/2054/files/contemporary_management_9th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0432/0867/1400/files/cristianismo_romano.pdf
    • https://cdn.shopify.com/s/files/1/0459/9529/4887/files/jiwopiforoxabuzafadole.pdf
    • https://static.usrfiles.com/ugd/b8c837_6856c0cdcb6f437490f3127a4ce77cb9.pdf
    • https://static.usrfiles.com/ugd/a64c8c_55b9ec073c9144daa44a8bc71b962101.pdf
    • https://static.usrfiles.com/ugd/b5aed9_2808b69c22284f07b8d6979e14609f49.pdf
    • https://static.usrfiles.com/ugd/01e791_c821dbb8a9a04ca497d67365a15a8e28.pdf
    • https://static.usrfiles.com/ugd/e4a001_dc0db562f3774a219f9de38aed8dc652.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005d7c.bin
3df2a26b1d51e162eb912d67fcf67e2e824aa11cd56b10d4c4fe99f33cb623f5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5D7C 5280 bytes
font_01_sfnt_off00006f75.bin
025919985face6884693fc3da3605c1c2144b4e527c9c6947fa8a7f5a07dc605		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F75 9996 bytes

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