Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7cb375185ac37af…

MALICIOUS

PDF

41.1 KB Created: 2020-11-02 17:02:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 75b2ccc8c7034d39032f9dea13830220 SHA-1: 79ecd957c158e4b7201f9d4007ba3763bef3da0b SHA-256: f7cb375185ac37af42640de5e932ff0bd88da3224ea48a8bd5fb3fbbc55fb044
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded links, with a critical heuristic firing indicating it points to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains a URL that aligns with the malicious redirector. The ML classifier also strongly flagged this PDF as malicious, suggesting a high likelihood of it being used for phishing or malware distribution.

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://ggtraff.ru/strik?keyword=glass+houses+free+read In PDF document text
    • https://cdn-cms.f-static.net/uploads/4378160/normal_5f98be9f9f186.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416149/normal_5f9e82cc6c81a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404745/normal_5f926d85d7a17.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387921/normal_5f9cf2155d397.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419857/normal_5f98de419827f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371247/normal_5f8c75d51e155.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/8893/1735/files/chain_come_along_lowes.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/4797/1735/files/rixegekotet.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0500/5079/3658/files/46138364947.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cbc01202-25c9-49f6-a002-3993ffbed618/zijadodalizujetixegobep.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0505/4788/4217/files/jamaican_patois_dictionary_apk_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/62697298-6d38-42a2-adb2-f470b82f5355/captain_underpants_and_the_attack_of_the_talking_toilets.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/3922/7047/files/lewutewes.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0486/4242/5000/files/prenatal_genetic_diagnosis.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0502/3308/2014/files/kasidatadimajemataduz.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000063cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x63CD 5024 bytes
SHA-256: 173c254c56794885d3b0bb2798a5c54643ef668e74ca16c9482c150e354b6239
font_01_sfnt_off000074d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x74D9 10096 bytes
SHA-256: 52348ae72b6b369ef8191e528cd5593dafd3bcf186d4a1b703fbc9df5a2a6516

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