Malicious PDF — malware analysis report

Static analysis result for SHA-256 df44298c66898768…

MALICIOUS

PDF

84.3 KB Created: 2020-12-30 11:41:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 095b60281e1336d97c0a7e42f2fd0765 SHA-1: 740ee5a343d798860afb77e53b02cbf8601cce33 SHA-256: df44298c66898768fbe3df482c23d654c0da4ca91872fb92eae8bd4951f4aad9
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 pointing to 'https://cctraff.ru/strik?utm_term=war+robots+vs+world+of+tanks'. Additionally, it exhibits characteristics of a PDF link farm with numerous external links, suggesting a phishing or spamming campaign. The ML classifier also strongly flagged this PDF as malicious.

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://cctraff.ru/strik?utm_term=war+robots+vs+world+of+tanks
    • https://viradigoposexa.weebly.com/uploads/1/3/4/3/134383508/1713220.pdf
    • https://widuboxizivibib.weebly.com/uploads/1/3/4/3/134315701/kunozam-batojejazijit-lupulet.pdf
    • https://zadujemerumid.weebly.com/uploads/1/3/2/6/132695269/76fe12.pdf
    • https://niwejeru.weebly.com/uploads/1/3/4/3/134308800/796e8e321eec72.pdf
    • https://nawezuto.weebly.com/uploads/1/3/4/5/134595998/fokizanidedupoj_renulused_dorofagazul_tilema.pdf
    • https://belogukuke.weebly.com/uploads/1/3/1/6/131637095/1864235.pdf
    • https://sigudajofabi.weebly.com/uploads/1/3/4/6/134679089/natulanera.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/jaloto/daduz.pdf
    • https://s3.amazonaws.com/xeroguru/brain_on_fire_susannah_cahalan.pdf
    • https://s3.amazonaws.com/gisujubolidine/lusasu.pdf
    • https://s3.amazonaws.com/bevarolimesale/fibijotijazibumojakuxame.pdf
    • https://s3.amazonaws.com/sojebelevenex/41903461168.pdf
    • https://s3.amazonaws.com/nemafu/credit_suisse_wealth_report_2015.pdf
    • https://s3.amazonaws.com/remavuj/aadukalam_video_songs_1080p.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_off00010bf3.bin
210d872b2aa098aec0eeed8c98ba9803dd869b1c9fc3a31ff3212b7d3774e78a
pdf-font-stream PDF embedded font (sfnt) at offset 0x10BF3 5272 bytes
font_01_sfnt_off00011e08.bin
522df587ef775179cc580ccbc3f0ed3fe00566a45cf47771166f2a40e6191061
pdf-font-stream PDF embedded font (sfnt) at offset 0x11E08 11120 bytes