Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4e20d11b2c05808…

MALICIOUS

PDF

177.2 KB Created: 2020-11-10 21:05:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1969eac0adf9b43c59ebe497608f9df2 SHA-1: 5845c6eb07f258c07c841e688bf93f0eaff9e080 SHA-256: f4e20d11b2c05808d5205bfd87efe18d6fd741584400651d71f722dff3487aea
194 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 a malicious redirector link pointing to 'gettraff.ru'. Additionally, a high-severity heuristic indicates an MFA lure, suggesting credential harvesting. The ML classifier also flagged the PDF with high confidence. While no scripts were extracted, the presence of a malicious URL and the MFA lure strongly indicate a phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • 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://gettraff.ru/123?keyword=buffalo+rifle+kits
    • https://cdn-cms.f-static.net/uploads/4417039/normal_5f9bd74bf0eba.pdf
    • https://cdn-cms.f-static.net/uploads/4371809/normal_5f88a5af559f3.pdf
    • https://cdn-cms.f-static.net/uploads/4368478/normal_5f91721061466.pdf
    • https://cdn-cms.f-static.net/uploads/4366653/normal_5f87421596ce9.pdf
    • https://cdn-cms.f-static.net/uploads/4447888/normal_5fa9c3df136fc.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/d9fc196a-3983-488e-8f8b-55f6c06a2615/53584010028.pdf
    • https://s3.amazonaws.com/tetazino/lawukezerojulijodopejom.pdf
    • https://s3.amazonaws.com/mijedusovineti/a_beginner_s_guide_to_investing_download.pdf
    • https://s3.amazonaws.com/welanisowari/xopokejededediruzoxe.pdf
    • https://s3.amazonaws.com/mamibis/love_nikki_cheats_no_survey.pdf
    • https://uploads.strikinglycdn.com/files/fcb02e77-ba6f-4fd9-af13-a6bb0762c112/tixufujijovakevorese.pdf
    • https://s3.amazonaws.com/xanebavifamopez/wibewumev.pdf
    • https://s3.amazonaws.com/nezanurugega/how_to_hack_on_moviestarplanet_2019.pdf
    • https://s3.amazonaws.com/regegozumekoza/trump_2020_flags_made_in_china.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/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00026159.bin
9d36311bfdcfd784964da337fc0ee89e1e99e643a2fea58b67ebc8158b2ea95c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x26159 4876 bytes
font_01_sfnt_off000271fe.bin
8e53129cbae7eb2e4f783f93dab7066f1a9dbc751a87fab6546deb66b56b155f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x271FE 15268 bytes
font_02_sfnt_off0002a1d4.bin
da133098c8ec00180ce5fe37c74b807b143adc5860869a2f7b6211e455203b10		 pdf-font-stream PDF embedded font (sfnt) at offset 0x2A1D4 16112 bytes

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