Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8066cd5d4d26b3a…

MALICIOUS

PDF

50.0 KB Created: 2020-08-22 17:02:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 38fac9f8a71c16cc22caf1d2820b69d5 SHA-1: ad3ed2ba84d1ad048dd30eb3da7af0228dcb925e SHA-256: c8066cd5d4d26b3af8cd119a63b082603e62440262d1f6bbb15c68861cc3d56d
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a critical heuristic firing for a malicious redirector link, which is also present in the document body. This link, 'https://ttraff.cc/pify?keyword=new+punjabi+video+song+2019++bestwap', is designed to redirect users to malicious content. The document also exhibits characteristics of a PDF link farm, with numerous embedded URLs pointing to external resources, many hosted on Shopify. The ML classifier strongly indicated maliciousness, supporting the conclusion that this PDF is part of a distribution campaign.

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.cc/pify?keyword=new+punjabi+video+song+2019++bestwap
    • http://files.ceocapitalfunding.com/uploads/1/3/1/3/131380001/2b644a1a8c747a.pdf
    • http://files.mrsdanabeck.com/uploads/1/3/1/6/131637024/musewubarakunemu.pdf
    • http://kazabo.nfordtransitsystem.com/uploads/1/3/1/4/131408899/6dd06.pdf
    • https://cdn.shopify.com/s/files/1/0431/7921/2959/files/9867410632.pdf
    • https://cdn.shopify.com/s/files/1/0429/1713/4502/files/71125210688.pdf
    • https://cdn.shopify.com/s/files/1/0434/2064/7576/files/mokezux.pdf
    • https://cdn.shopify.com/s/files/1/0430/0419/9075/files/mm2_bursting_guide_osrs.pdf
    • https://cdn.shopify.com/s/files/1/0427/4749/4567/files/apex_launcher_pro_apk.pdf
    • https://cdn.shopify.com/s/files/1/0440/0198/4662/files/fimofobuwu.pdf
    • https://cdn.shopify.com/s/files/1/0434/3152/6561/files/57229916761.pdf
    • https://cdn.shopify.com/s/files/1/0436/4170/0505/files/20599550475.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/dogazuzotefoninu.pdf
    • https://cdn.shopify.com/s/files/1/0428/5192/6183/files/gasalagezudotuzevi.pdf
    • https://cdn.shopify.com/s/files/1/0437/1264/3223/files/acute_pyelonephritis_in_adults_nejm.pdf
    • https://cdn.shopify.com/s/files/1/0432/8914/9608/files/97624224791.pdf
    • https://cdn.shopify.com/s/files/1/0444/2108/7398/files/personal_development_definition.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_off00007730.bin
041d97a53a2bd9dcabb759f120ebd7e2fce29cdd30cf5b70c8f916b7a890c726		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7730 5816 bytes
font_01_sfnt_off00008b26.bin
63e019d60e2653cd9e09fd7583f41f53203d83ca12e1e4980b6e075d567eb456		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8B26 15260 bytes

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