Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2b19c36eafcdf0c…

MALICIOUS

PDF

73.9 KB Created: 2020-12-31 22:54:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ae45110bb7e3fdbb684bef75303874c3 SHA-1: 149531e55718d28c836dbb536930ed65c38f8215 SHA-256: b2b19c36eafcdf0c7939fde3d032557a04ffacdb2e93073586bbb8c3df7bdde8
254 Risk Score

Malware Insights

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

The PDF contains embedded links to known malicious redirector infrastructure, specifically `https://ggtraff.ru/123?utm_term=hotmail+sign+up+page`, and a large number of other external PDF links, suggesting a link farm for SEO manipulation or malware distribution. The heuristic `SE_PASSWORD_ARCHIVE_LURE` indicates that the document may be intended to trick users into downloading a password-protected archive, which is a common tactic to bypass gateway security. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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=hotmail+sign+up+page
    • https://nimitokusewifoj.weebly.com/uploads/1/3/4/6/134647116/021a0f02f6d23.pdf
    • https://cdn.sqhk.co/sovokeduseb/Qhcic1Z/inside_out_chords_and_lyrics_eve_6.pdf
    • https://cdn.sqhk.co/dimusokobab/iaiijbv/kabeluletaguvuboj.pdf
    • https://basitonivi.weebly.com/uploads/1/3/4/5/134584834/vodofolejaxeleligiza.pdf
    • https://xeziguga.weebly.com/uploads/1/3/5/3/135392729/wemafon.pdf
    • https://cdn.sqhk.co/vuzefegevo/spcicgg/the_heavy_is_dead_among_us.pdf
    • https://dopapebo.weebly.com/uploads/1/3/4/8/134870178/sevupavowivuno-dugabunazi-vofimidizuxuv.pdf
    • https://cdn.sqhk.co/tixelila/kJOg2jb/92692239195.pdf
    • https://cdn.sqhk.co/pujigaloruri/Hhfghif/health_science_reports_journal_impact_factor.pdf
    • https://cdn.sqhk.co/totuzilexif/jic1jji/xisotarefoso.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/8eea8c03-fbc0-4fbc-893a-21d26700ab06/badesogesovegawuvozurifuj.pdf
    • https://uploads.strikinglycdn.com/files/98e0bd21-481a-44e4-8378-0cc1be11a9b7/92845937892.pdf
    • https://uploads.strikinglycdn.com/files/e8232674-bf16-43e4-9385-47f5008a8ce4/boy_scout_investiture_ceremony_script.pdf
    • https://uploads.strikinglycdn.com/files/b8d41b7b-e9b5-4654-b85c-ac072c7f7bd5/63223550269.pdf
    • https://uploads.strikinglycdn.com/files/fd8da97b-2a99-4173-8df6-e04125e1b38e/kututimijesulaz.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e46b.bin
0ae5c0ff40ed611cbd22df19a767997bd64b3f58c4a4c415dc0a4f02c9e88b80		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE46B 5004 bytes
font_01_sfnt_off0000f55c.bin
1a8903d92051bb1d05a3a29ad9f81817ab40f0c4a89ea11e8250531d8720617c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF55C 10884 bytes

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