Malicious PDF — malware analysis report

Static analysis result for SHA-256 494bef1ce0ed8a83…

MALICIOUS

PDF

76.5 KB Created: 2021-01-20 20:18:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ba795ea44d614e357dd8f5824c5eac94 SHA-1: 74ea9fa4aeaa63c5ec44143665def57b8cff9774 SHA-256: 494bef1ce0ed8a833f4c62b80fa963d8e7d665f041ddfbbd14bc86d7eb206a8e
214 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure, specifically 'https://ggtraff.ru/123?utm_term=animal+mashups+generator'. Additionally, it exhibits characteristics of a PDF link farm with numerous external links, suggesting a phishing or malware distribution 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-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://ggtraff.ru/123?utm_term=animal+mashups+generator
    • https://vaxatimiroxak.weebly.com/uploads/1/3/4/6/134617636/renijom-lasatox-linuguwewexofoj-zogefukug.pdf
    • https://site-1173424.mozfiles.com/files/1173424/21865563654.pdf
    • https://mekuzawejonoma.weebly.com/uploads/1/3/1/6/131606345/1238230.pdf
    • https://static.s123-cdn-static.com/uploads/4474977/normal_5fde67dc8b854.pdf
    • http://kijorifoweb.22web.org/programming_fundamentals_coursera_answers.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/satedafadusizo/beckman_coulter_access_2_user_manual.pdf
    • http://fakuzilezozo.epizy.com/basic_information_about_computer_in_gujarati.pdf
    • http://rezumasalimod.epizy.com/telategek.pdf
    • http://potopaf.epizy.com/mevamomidiwes.pdf
    • https://s3.amazonaws.com/bidemewufa/fotogozawulu.pdf
    • https://s3.amazonaws.com/suzujewa/550642755.pdf
    • https://s3.amazonaws.com/sesijesule/aplikasi_anonytun_untuk_iphone.pdf
    • https://s3.amazonaws.com/wulotugadag/corymbia_citriodora_fact_sheet.pdf
    • https://s3.amazonaws.com/kosipefojaw/factsheet_research_inc.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_off0000ee0b.bin
247066135f18a238ecac0d85f8519732bc48de9645a4e4ef60e1b2789e59f2b2
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE0B 5224 bytes
font_01_sfnt_off0000ffa0.bin
736c59e95661796a3e1cd8e040ab639622ffc6105749b8de185039d23d870991
pdf-font-stream PDF embedded font (sfnt) at offset 0xFFA0 10996 bytes