Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7268f84a2fd85c9…

MALICIOUS

PDF

40.3 KB Created: 2020-11-01 11:02:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: f3a18bfabf32cf57bd1d7b6c085e692f SHA-1: 6a0a699ef25ca2cabf8d6999cc36aa9b08f78f1b SHA-256: b7268f84a2fd85c9d758c87e2eb38f3df6b242990171a7689295f7103c5e9016
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains a critical heuristic firing for brand-impersonation credential phishing, specifically targeting Facebook. It leverages a malicious redirector URL, 'https://ggtraff.ru/wb?keyword=vvsd%20portal%20login', which is also listed as a known malicious redirector. The document body, though heavily obfuscated, contains references to the redirector URL and appears to be generated by wkhtmltopdf, a tool sometimes used to create malicious PDFs. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Brand-impersonation credential phishing lure critical SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: action link to abused redirector https://toxavikosas.weebly.com/uploads/1/3/4/4/134437834/7242578.pdf.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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/wb?keyword=vvsd%20portal%20login In PDF document text
    • https://cdn-cms.f-static.net/uploads/4385631/normal_5f9cfcb55431f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373986/normal_5f918f3c91311.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374178/normal_5f9d9d95711cd.pdfIn PDF document text
    • https://toxavikosas.weebly.com/uploads/1/3/4/4/134437834/7242578.pdfIn PDF document text
    • https://kenilajapa.weebly.com/uploads/1/3/1/0/131069910/lejesof_jenizo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367631/normal_5f875f7491e10.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/1/0501/8235/7170/files/dsssb_vacancy_2020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4104782a-74bc-4689-9783-1cdcad986ac4/65075249671.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f3bbf1cb-3df8-4d05-b908-f42d58243aac/13587921255.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/2009/4104/files/social_justice_john_rawls.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/df646ab7-6aa5-4a77-868e-bd0e6e37f584/sagixujutijasovovegozam.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_off0000602f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x602F 5152 bytes
SHA-256: c76e5029a2f7bbfb7f59be9e51ee1c94c9541c32780dbceb6df6625241b23a01
font_01_sfnt_off000071cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x71CF 10436 bytes
SHA-256: 3ae7d711e8f4593ff49aee9c2203d654cb8ce2b0d0ebb4cbcea3676bdd1c1a92

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