Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f0fd758c641137f…

MALICIOUS

PDF

66.1 KB Created: 2020-12-06 01:44:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2b7c5204e26b282a5e2fccc7fa012d8b SHA-1: d1613c32fb84873bc879b3fe9fc2996246382e92 SHA-256: 7f0fd758c641137fbca134a50b9aaeee8285a82dc22b17fdf52ab6585f848622
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, directing users to 'https://gettraff.ru/aws?utm_term=difference+of+fitted+sheet+and+flat+sheet'. This indicates a phishing attempt to redirect users to a malicious site. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://gettraff.ru/aws?utm_term=difference+of+fitted+sheet+and+flat+sheet
    • https://static.s123-cdn-static.com/uploads/4499629/normal_5fcc157129b09.pdf
    • https://cdn-cms.f-static.net/uploads/4422908/normal_5fc027b070701.pdf
    • https://static.s123-cdn-static.com/uploads/4427091/normal_5fc97bfb6532d.pdf
    • https://cdn-cms.f-static.net/uploads/4402297/normal_5f91898f24bc1.pdf
    • https://static.s123-cdn-static.com/uploads/4427526/normal_5fc693f38450f.pdf
    • https://cdn-cms.f-static.net/uploads/4367911/normal_5fbbda3540d48.pdf
    • https://cdn-cms.f-static.net/uploads/4492259/normal_5fb53e5a4ef88.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/912662ac-bd8a-4cfd-be8c-4fb4dbb9696e/fositiwuginefuxukajiges.pdf
    • https://uploads.strikinglycdn.com/files/4352502a-c023-4e1d-9838-1c06a0d0d776/31152546253.pdf
    • https://uploads.strikinglycdn.com/files/83dcd8c5-2be0-49ec-824d-c4445eafaa4e/xuwoluvebifofe.pdf
    • https://uploads.strikinglycdn.com/files/0b92fdf8-a214-4745-bce0-35229ea1fc5a/48175839703.pdf
    • https://uploads.strikinglycdn.com/files/423e7c4a-221a-4a65-b687-0ea6116b515b/59167073153.pdf
    • https://uploads.strikinglycdn.com/files/17a4e95b-b76b-4099-a199-d38864451c6e/kuvedatopexa.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_off0000c7ab.bin
1e59f4c90982319862a3970d86b188aad3f044995db920ecff7b28d4b7ec1dd8
pdf-font-stream PDF embedded font (sfnt) at offset 0xC7AB 5108 bytes
font_01_sfnt_off0000d90f.bin
9555b63e0d25f1dccd4a41d2769d7d2725d1d96d705754ee609e2d758649ef6e
pdf-font-stream PDF embedded font (sfnt) at offset 0xD90F 10424 bytes