Malicious PDF — malware analysis report

Static analysis result for SHA-256 6279937dce17fcef…

MALICIOUS

PDF

63.3 KB Created: 2020-11-09 17:44:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a966aabc1651b9cd7eb67788ef610b60 SHA-1: 75e6fd72947a74065f694fb290413cae8784d7e4 SHA-256: 6279937dce17fcef9b558460593602627cae7c7777e969a63d954b23d03eafd8
214 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing indicating it links to known malicious redirector infrastructure, specifically `https://traffmen.ru/strik?keyword=the+docker+book+pdf+download`. Additionally, it features a large number of embedded links, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection further support its malicious nature. No scripts were extracted, but the primary attack vector appears to be directing users to malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • 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
  • 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://traffmen.ru/strik?keyword=the+docker+book+pdf+download
    • https://cdn-cms.f-static.net/uploads/4416143/normal_5f9b0327b5c78.pdf
    • https://sepenunaxob.weebly.com/uploads/1/3/0/7/130776074/visutelagusege.pdf
    • https://zunivagakasati.weebly.com/uploads/1/3/4/3/134340202/veluvos.pdf
    • https://cdn-cms.f-static.net/uploads/4383679/normal_5f9b20884d157.pdf
    • https://cdn-cms.f-static.net/uploads/4391331/normal_5f923997b4a12.pdf
    • https://cdn-cms.f-static.net/uploads/4393632/normal_5f9fb4af69e40.pdf
    • https://lidisujuv.weebly.com/uploads/1/3/4/5/134515282/xamilagikonam.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/jepavilutabilel/capitulo_1b_realidades_2_answers.pdf
    • https://s3.amazonaws.com/subud/65691428709.pdf
    • https://s3.amazonaws.com/xilasisefi/the_office_pops_wave_2.pdf
    • https://s3.amazonaws.com/petuzutemixuvod/falling_action_in_the_hunger_games.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_off0000bbfd.bin
d5684a2d34ac64cc542999d9a4c9277ec13f26f87e76a2217c210bd07153dc2c
pdf-font-stream PDF embedded font (sfnt) at offset 0xBBFD 5308 bytes
font_01_sfnt_off0000ce15.bin
7c888732a4bd710ea1de787cb5abae39d4dc7d39df4b1cb5ed8e79fb4e234bac
pdf-font-stream PDF embedded font (sfnt) at offset 0xCE15 10036 bytes