Malicious PDF — malware analysis report

Static analysis result for SHA-256 731088663bf361cb…

MALICIOUS

PDF

41.6 KB Created: 2020-08-07 03:03:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 00fa7ecb5ad925f4b826516d2eee4f0e SHA-1: a1f4d8c5bd34e532b383fe3e810d40d8a76b7f32 SHA-256: 731088663bf361cb2cd2be5bb65f60f6131d47e1031015aa52ba1c935e4cbd04
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a significant number of embedded links, many pointing to external PDF files hosted on various domains, which is indicative of a link farm or SEO manipulation tactic. One critical heuristic identified a link to known malicious redirector infrastructure, suggesting a potential for malicious redirection. The ML classifier also strongly flagged this PDF as malicious.

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.ru/wb?keyword=reutilizaci%C3%B3n%20de%20aguas%20residuales%20pdf
    • http://files.mmhsphoto.com/uploads/1/3/0/7/130739651/909d0f.pdf
    • http://files.eguastella.com/uploads/1/3/0/9/130969546/4582363.pdf
    • http://files.americansemi.com/uploads/1/3/1/8/131855992/jaranaxoragajovux.pdf
    • http://doxevu.jlsmither.com/uploads/1/3/1/1/131164312/8933318.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0439/5663/3758/files/modern_physics_6th_edition_tipler.pdf
    • https://cdn.shopify.com/s/files/1/0427/6181/4172/files/festo_pneumatic_valves_catalogue.pdf
    • https://cdn.shopify.com/s/files/1/0430/5672/6165/files/15969527428.pdf
    • https://cdn.shopify.com/s/files/1/0428/9619/5737/files/basic_of_programming_language.pdf
    • https://cdn.shopify.com/s/files/1/0430/0580/4698/files/cancer_types_and_treatment.pdf
    • https://cdn.shopify.com/s/files/1/0431/0371/5489/files/malogelepowuralefepe.pdf
    • https://cdn.shopify.com/s/files/1/0431/2888/1313/files/wixogujemupis.pdf
    • https://cdn.shopify.com/s/files/1/0437/9135/1969/files/pale_rider_persona_5.pdf
    • https://cdn.shopify.com/s/files/1/0439/3612/0990/files/espn_college_hockey_scores.pdf
    • https://cdn.shopify.com/s/files/1/0441/0084/5720/files/polymeric_biomaterials.pdf
    • https://cdn.shopify.com/s/files/1/0433/0654/9406/files/15228479865.pdf
    • https://cdn.shopify.com/s/files/1/0433/6680/9765/files/texas_drivers_license_renewal.pdf
    • https://cdn.shopify.com/s/files/1/0432/0365/7887/files/48559257815.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_off000062c5.bin
563b2a6c88f7546b5a6c8e9cd511b771af10dba7cfb4e74dda05b14f9b084d12		 pdf-font-stream PDF embedded font (sfnt) at offset 0x62C5 5516 bytes
font_01_sfnt_off00007567.bin
db43532184c369f104b695ebacf03c3d5e3033aafed5c0faaab0c93e58643ead		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7567 10468 bytes

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