Malicious PDF — malware analysis report

Static analysis result for SHA-256 f26fb5113ccb7bb3…

MALICIOUS

PDF

48.9 KB Created: 2020-11-07 10:49:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: f19c2870ca1774cca42161a28157aa6d SHA-1: 494a67bac2cbe4305c25efc981a8fc7ee0d9704a SHA-256: f26fb5113ccb7bb35249667734cf27b6a37345a2c51fc6cf4b5b492cb5fdd76e
244 Risk Score

Malware Insights

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

This PDF file was identified as malicious due to its function as a brand-impersonation credential phishing lure. It contains numerous embedded links, including a critical redirector link to 'https://cctraff.ru/wb?keyword=unblocked%20online%20games%20shooter', which is designed to lead users to malicious content. The document body, though heavily obfuscated, also contains URLs pointing to link farms hosted on disposable infrastructure, further indicating a malicious intent to distribute harmful content or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • 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://papunagaku.weebly.com/uploads/1/3/1/3/131384156/labuj.pdf.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://cctraff.ru/wb?keyword=unblocked%20online%20games%20shooter In PDF document text
    • https://cdn-cms.f-static.net/uploads/4365608/normal_5f9a65eb8dcd2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370092/normal_5f8c4319ae803.pdfIn PDF document text
    • https://papunagaku.weebly.com/uploads/1/3/1/3/131384156/labuj.pdfIn PDF document text
    • https://dufevirefat.weebly.com/uploads/1/3/1/4/131438490/a8f8e4e986ae.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369142/normal_5f8d2184240c1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374689/normal_5f974683254ec.pdfIn PDF document text
    • https://xikosenazegan.weebly.com/uploads/1/3/0/7/130739601/7f6ddda14b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417662/normal_5f9a4d51be11a.pdfIn PDF document text
    • https://xogexemufak.weebly.com/uploads/1/3/1/4/131437987/8ce4384d566a.pdfIn PDF document text
    • https://xijuwubime.weebly.com/uploads/1/3/4/2/134234920/3709441.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/jevuxozazebazug/arthur_miller_all_my_sons_play.pdfIn PDF document text
    • https://puraduj.files.wordpress.com/2020/11/turunuzidofe.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_off0000802d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x802D 5548 bytes
SHA-256: 26db57484a752d709986c1a57b35c10d45fc81fd7917742d918381fa4f531ad0
font_01_sfnt_off000092e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x92E2 10640 bytes
SHA-256: dbc256e846cb7d463858821cfc116fde24f85ec9b404b21cacf2b52f1e26edeb

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