Malicious PDF — malware analysis report

Static analysis result for SHA-256 704095f7cbe8d66a…

MALICIOUS

PDF

40.4 KB Created: 2020-08-11 07:35:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 043e339422a826283826494030c237d9 SHA-1: 031c031c82234c83056dcc37521d81e4c5ae3374 SHA-256: 704095f7cbe8d66a04ad161e6330a26e010b9963f578404ec95888b8dd430868
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many of which point to a link farm designed to host other PDFs. One critical heuristic identified a link to known malicious redirector infrastructure, specifically 'ttraff.com', which is used to obscure the final malicious destination. The document body text, though partially corrupted, includes the phrase 'Appeal letter sample pdf', suggesting a lure to trick users into clicking the malicious links.

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.com/pify?keyword=appeal+letter+sample+pdf
    • http://files.robertdickstudionyc.com/uploads/1/3/2/7/132711999/mijozinorisoji.pdf
    • http://gepajexi.doorwaytodignityabuserecovery.com/uploads/1/3/1/4/131407089/vivaxuraxudade_febatapaxibusig_wipenabirak.pdf
    • http://legekeb.thenecessarian.com/uploads/1/3/1/4/131453850/vadazava-popuf.pdf
    • http://files.jeannecorrigal.com/uploads/1/3/1/3/131398526/ratapulata.pdf
    • http://files.sproutmeadows.com/uploads/1/3/1/6/131637273/bb180bd5e9.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/8130/9083/files/nisadawefujelopugul.pdf
    • https://cdn.shopify.com/s/files/1/0431/7646/0445/files/27046685238.pdf
    • https://cdn.shopify.com/s/files/1/0435/4539/5359/files/nottingham_map.pdf
    • https://cdn.shopify.com/s/files/1/0435/1416/7450/files/cat_forklift_manual.pdf
    • https://cdn.shopify.com/s/files/1/0432/0336/2975/files/giwafolarepolujaguna.pdf
    • https://cdn.shopify.com/s/files/1/0427/6623/7852/files/38424434588.pdf
    • https://cdn.shopify.com/s/files/1/0437/4193/7818/files/badowiwozazizedukol.pdf
    • https://cdn.shopify.com/s/files/1/0431/8052/3678/files/birumazopuwijin.pdf
    • https://cdn.shopify.com/s/files/1/0428/9685/1111/files/kurakixakofarex.pdf
    • https://cdn.shopify.com/s/files/1/0433/8896/0933/files/bujigidetitadin.pdf
    • https://cdn.shopify.com/s/files/1/0431/2619/4336/files/25410997099.pdf
    • https://cdn.shopify.com/s/files/1/0434/0659/0104/files/repajiv.pdf
    • https://cdn.shopify.com/s/files/1/0439/2802/7304/files/43574640244.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_off00006072.bin
96efd95e21699c015186b711d75bf3e78c8ef26649dfbc7db290be0fe6a146b9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6072 5176 bytes
font_01_sfnt_off000071f6.bin
ad53151878e101faabafb3f3aa157f193bec099ff34acaf49ac42b7682d05fe8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x71F6 10288 bytes

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