Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa7184ae91917b21…

MALICIOUS

PDF

69.2 KB Created: 2020-12-29 18:43:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e6510813a7a2561b1955c988311bd4ae SHA-1: 638a1ed06f7d4d0b368ef25c9635d456aa8f7a9f SHA-256: fa7184ae91917b21d3a4eadc31d1cfa3dfe9a4634b1e2201b709a42503f7cb08
244 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to known malicious redirectors or disposable hosting. The primary redirector URL identified is 'https://ggtraff.ru/strik?utm_term=cut+restored+rope+trick+revealed'. This structure suggests the document is designed to lure users into clicking malicious links, likely for phishing or to download further malware. No scripts were extracted, but the PDF structure itself facilitates the malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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://ggtraff.ru/strik?utm_term=cut+restored+rope+trick+revealed
    • https://cdn-cms.f-static.net/uploads/4375077/normal_5fd37bab81874.pdf
    • https://zifekibovaliw.weebly.com/uploads/1/3/1/8/131871714/8233129.pdf
    • https://dexidexida.weebly.com/uploads/1/3/4/2/134235246/4320473.pdf
    • https://static.s123-cdn-static.com/uploads/4500200/normal_5fe38abeb3031.pdf
    • https://sitiguzesamow.weebly.com/uploads/1/3/4/4/134401829/tapapubebodod.pdf
    • https://zunuduzeguw.weebly.com/uploads/1/3/4/3/134344012/b5a39d394.pdf
    • https://wasumorupukefu.weebly.com/uploads/1/3/4/5/134581702/3938118.pdf
    • https://pixipemojawipe.weebly.com/uploads/1/3/4/4/134459682/bowamipojubu-mubirugon-nubaremavibe-vidosa.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/db4fbfec-c2ab-47e3-a8eb-be512aec70ea/99529898164.pdf
    • https://uploads.strikinglycdn.com/files/a6441c3b-9b98-4c33-ab24-156ada65460a/list_of_1980s_anime_shows.pdf
    • https://s3.amazonaws.com/kewakuko/goodreads_free_download.pdf
    • https://s3.amazonaws.com/mixanaz/android_blur_image_programmatically.pdf
    • https://uploads.strikinglycdn.com/files/ffe57fab-23b7-41e8-b072-4b42f4ee98be/exercicios_probabilidade_ensino_fundamental.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_off0000d197.bin
97107e63a16e330eb432fc4136a63ebc1a17776286fa9633cae044f2aa8cded6
pdf-font-stream PDF embedded font (sfnt) at offset 0xD197 5096 bytes
font_01_sfnt_off0000e303.bin
f2f210f0341f1d552eaa3496eea43aa1aaa5c3e480f5fcb89b7c63708f968090
pdf-font-stream PDF embedded font (sfnt) at offset 0xE303 10848 bytes