Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b59a819f18c08c6…

MALICIOUS

PDF

45.7 KB Created: 2020-08-08 01:55:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 550ea5c94e6c1bb2667d57caab693169 SHA-1: 2752ffeac6a0f60d562e6ff5adfa37fb11e734bc SHA-256: 5b59a819f18c08c63d518b9906c32afa63fb07fa13e93c56148a72c7e0997127
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link to a redirector service, which is a common technique for distributing malware or phishing pages. The PDF also hosts a large number of links to other PDFs, suggesting a link farm SEO abuse. The primary malicious URL identified is https://ttraff.com/pify?keyword=advantages+and+disadvantages+of+reading+aloud+pdf, which is flagged as a malicious redirector.

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=advantages+and+disadvantages+of+reading+aloud+pdf
    • http://files.appraisalprogroup.com/uploads/1/3/0/8/130813079/piwovonu.pdf
    • http://files.hconceptshop.com/uploads/1/3/0/7/130775744/lujikuliko-towajokuwi-zulina-pigenelebojimo.pdf
    • http://files.creativelybeautify.com/uploads/1/3/1/4/131408169/pelijegokev.pdf
    • http://files.aidfirst.org/uploads/1/3/1/1/131164569/lasarusuludutipoluzi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/2537/5125/files/7136075009.pdf
    • https://cdn.shopify.com/s/files/1/0449/9626/4094/files/budismo_zen_y_psicoanalisis_erich_fromm.pdf
    • https://cdn.shopify.com/s/files/1/0438/5947/6630/files/zekujizosugonili.pdf
    • https://cdn.shopify.com/s/files/1/0428/7086/6076/files/soxukenijimopaxiviwizo.pdf
    • https://cdn.shopify.com/s/files/1/0434/8336/5528/files/airliner_world_november_2020.pdf
    • https://cdn.shopify.com/s/files/1/0444/4500/8039/files/calisthenics_workout_exercises.pdf
    • https://cdn.shopify.com/s/files/1/0434/2520/2325/files/werinemesexaxunizizakazas.pdf
    • https://cdn.shopify.com/s/files/1/0437/6903/6958/files/mongodb_shell_commands.pdf
    • https://cdn.shopify.com/s/files/1/0438/6009/9222/files/zipupedevalilibejukaxesod.pdf
    • https://cdn.shopify.com/s/files/1/0441/1644/3288/files/harvest_maid_dehydrators.pdf
    • https://cdn.shopify.com/s/files/1/0430/3749/1354/files/dulezogozavadudaxi.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_off0000742b.bin
6fb8a9f16961e02921d5f044af5213d743c1b99ab3232f2faa1ebb9855673e44		 pdf-font-stream PDF embedded font (sfnt) at offset 0x742B 5256 bytes
font_01_sfnt_off00008629.bin
ec3109768cff845d7bd0d75f4126b2fd8f2bfb5e537837217e852e8db5b7d6c3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8629 10372 bytes

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