Malicious PDF — malware analysis report

Static analysis result for SHA-256 50a8ae180aa43c9d…

MALICIOUS

PDF

70.6 KB Created: 2020-11-26 04:04:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9800c812f4c21c7ff422d2ac73a65f55 SHA-1: 1415b7191c1f2d713f5800cfccb7aba098f451fc SHA-256: 50a8ae180aa43c9dbe7862a8d72e800794b3464de708732bdfa9e851fc25af8d
154 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, which is also flagged by ClamAV and a machine learning classifier as malicious. The document body, though heavily obfuscated, contains text related to car sales, suggesting a phishing lure. No scripts were extracted, but the presence of a malicious URL strongly indicates a phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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-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/123?utm_term=cheap+v8+cars+under+%25243+000
    • https://cdn-cms.f-static.net/uploads/4413978/normal_5fa416684fbd2.pdf
    • https://cdn-cms.f-static.net/uploads/4388814/normal_5fa14772a322d.pdf
    • https://cdn-cms.f-static.net/uploads/4452608/normal_5fa984f1e5492.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/ribowexulo/lotabuvedalilotug.pdf
    • https://s3.amazonaws.com/wizitifowubux/kali_linux_vmware_free.pdf
    • https://uploads.strikinglycdn.com/files/56afcbc9-00d9-4849-a8b8-26d3f3c0e2ae/get_this_guy_a_puppers_meme.pdf
    • https://uploads.strikinglycdn.com/files/a9ad58ae-1923-4193-bc9e-a77ede0dd8ff/bovuwobudemovuzono.pdf
    • https://s3.amazonaws.com/rupatojuko/montreal_canada_phone_code.pdf
    • https://s3.amazonaws.com/mawesenasijoser/36416741535.pdf
    • https://s3.amazonaws.com/dabatisew/bleach_ending_songs.pdf
    • https://uploads.strikinglycdn.com/files/16d0af19-6914-4737-b22f-f74594edc5a3/raid_shadow_legends_bluestacks_hack.pdf
    • https://uploads.strikinglycdn.com/files/02c80c69-1012-4311-b5e5-f568cc3f275a/purowa.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c8b9.bin
5468c95c0f289c05b594751823e8c01df6fc2d23faf04cb3a30296906403e0d2
pdf-font-stream PDF embedded font (sfnt) at offset 0xC8B9 5596 bytes
font_01_sfnt_off0000dbb6.bin
36812d0b784a8bc0f9a2a96bef5c0893cbf6e01602bb9283536fdc67d7410b0b
pdf-font-stream PDF embedded font (sfnt) at offset 0xDBB6 10600 bytes
font_02_sfnt_off0000ffe5.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34
pdf-font-stream PDF embedded font (sfnt) at offset 0xFFE5 4324 bytes