Malicious PDF — malware analysis report

Static analysis result for SHA-256 caf3351812da8851…

MALICIOUS

PDF

75.0 KB Created: 2020-12-29 23:52:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 3a45cbecebc8d204f1bd8718e6a75e54 SHA-1: 4a749764e55526a8530416904cdc35f9bbc2be05 SHA-256: caf3351812da8851c61b7e2878a7d3900773e52f251712801d08e22977513ed2
274 Risk Score

Malware Insights

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

The sample is a PDF file flagged by multiple critical heuristics for malicious redirector links and brand-impersonation credential phishing, specifically impersonating Netflix. The embedded URLs point to known malicious infrastructure, including a redirector at 'ggtraff.ru' and a phishing page hosted on 'wobadudubabu.weebly.com'. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://wobadudubabu.weebly.com/uploads/1/3/4/5/134510413/wipatana.pdf.
  • 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/123?utm_term=watch+guardians+of+the+galaxy+online In PDF document text
    • https://cdn-cms.f-static.net/uploads/4374847/normal_5fda91656de9e.pdfIn PDF document text
    • https://wobadudubabu.weebly.com/uploads/1/3/4/5/134510413/wipatana.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453560/normal_5fbabe51e85b6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367000/normal_5f886c3591240.pdfIn PDF document text
    • https://cdn.sqhk.co/werutojij/ja5IjfB/sipetemamuzege.pdfIn PDF document text
    • https://mutolumikiwow.weebly.com/uploads/1/3/1/8/131872082/7239958.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417983/normal_5fabd0353c9af.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480743/normal_5fb951513c989.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/adf916ad-dc3d-4a2e-88be-0d4449dadc00/roku_account_setup.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/478e65fd-8fee-46f7-851f-9f41ccb49a1c/70082096921.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/06a5c25a-e9ec-4b0d-b955-93c3fe04b843/87786275209.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/40e7f5e4-db59-4d0a-9c07-f779a25d619a/the_house_on_mango_street_no_speak_english_summary.pdfIn PDF document text
    • https://s3.amazonaws.com/jumedemimo/why_is_my_brother_sam_is_dead_banned.pdfIn PDF document text
    • https://s3.amazonaws.com/benubapopikaj/cast_iron_soil_pipe_fittings_handbook.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1a584409-0301-4583-b456-803bade6d0b3/34796566502.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_off0000e7dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7DD 5464 bytes
SHA-256: 6f1f4502d1cc0499fb58283c920d5e64a2e5fcdc5b0ae78e31d67fbf3fd08a0f
font_01_sfnt_off0000fa87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA87 10636 bytes
SHA-256: fcdb6af9c25f55bf3b795797629f931a292dd176f1a0b6f0a7050a8ac7434774

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