Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a1f93abc90468d9…

MALICIOUS

PDF

62.2 KB Created: 2020-11-25 02:51:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 11f62d930f19a0710c4f9f2626fc7fb4 SHA-1: da04802861631fb9bbfcfb02bddec066e548808b SHA-256: 4a1f93abc90468d908e0c180ec7c35139ba649fa37c874b6443669cca1b3a6d3
154 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link, identified by the 'PDF_MALICIOUS_REDIRECTOR_LINK' heuristic. The ML classifier also flagged this PDF with high confidence. The embedded URL points to a suspicious domain, likely intended to lure the user into downloading a secondary payload or visiting a phishing page.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 4

  • 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.
  • 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/aws?utm_term=kingspan+cladding+installation+guide
    • https://cdn-cms.f-static.net/uploads/4366367/normal_5f8741a4dfb7a.pdf
    • https://cdn-cms.f-static.net/uploads/4451756/normal_5fa9b3c12fa8a.pdf
    • https://cdn-cms.f-static.net/uploads/4368748/normal_5fa9b397d6397.pdf
    • https://cdn-cms.f-static.net/uploads/4465144/normal_5fbd96ac2f000.pdf
    • https://cdn-cms.f-static.net/uploads/4366343/normal_5fb9b5292b47e.pdf
    • https://cdn-cms.f-static.net/uploads/4385415/normal_5f8ee5a64e2d6.pdf
    • https://cdn-cms.f-static.net/uploads/4369917/normal_5fa6dbbec066a.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/vezumobigodub/biriyani_short_story_download.pdf
    • https://s3.amazonaws.com/subud/73330349361.pdf
    • https://uploads.strikinglycdn.com/files/362d29da-6850-432e-94a8-33c9c0dfe7c2/52442107243.pdf
    • https://s3.amazonaws.com/henghuili-files2/83087329966.pdf
    • https://s3.amazonaws.com/winumigutam/tamedulonekazuj.pdf
    • https://s3.amazonaws.com/kakef/wonis.pdf
    • https://uploads.strikinglycdn.com/files/e1c8672e-f0e2-4ee2-bc7e-87d15afc751f/lifupovonukukaxavuzukofa.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_off0000b788.bin
258291f7a7b1e264c8f3fbebb968ff983b67102a734dc3888f30d2f915ac181e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB788 5112 bytes
font_01_sfnt_off0000c90d.bin
d97668f6b3fbaed52502ba233d401a23b64a6935665baecf262f21ff417afa47		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC90D 10348 bytes

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