Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce8d8b6338d2e132…

MALICIOUS

PDF

32.6 KB Created: 2020-10-04 15:30:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: dfa5d069016c957d9db8a6801a7c4c71 SHA-1: ee631d8c0f95d4dd8675ba186ca3b0e7cb73f6c3 SHA-256: ce8d8b6338d2e132416fc792adbb401ddf85eeb3113cd480221f46e8ed9ccecb
124 Risk Score

Malware Insights

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

The PDF contains embedded URLs that lead to known malicious redirector infrastructure, specifically `https://gettraff.ru/strik?keyword=wade+8th+edition+solutions+manual`. The document body text, though corrupted, suggests a lure related to a 'solutions manual', aligning with the malicious redirector's keyword. The ML classifier strongly flagged this PDF as malicious, and heuristics indicate it's part of a link farm on disposable hosting, further supporting a malicious intent to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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/strik?keyword=wade+8th+edition+solutions+manual In PDF document text
    • http://ronuv.marcellusroyaltyaction.com/uploads/1/3/1/6/131637649/360691.pdfIn PDF document text
    • http://files.katarinatuffvesonjensen.com/uploads/1/3/1/4/131453990/9119646.pdfIn PDF document text
    • http://kenek.christierecords.in/uploads/1/3/0/8/130874368/zobani_zemilo_linalogusiduses_bixomesi.pdfIn PDF document text
    • https://site-1036748.mozfiles.com/files/1036748/fisegiwi.pdfIn PDF document text
    • https://site-1036767.mozfiles.com/files/1036767/4002243607.pdfIn PDF document text
    • http://files.southtownscatholic.org/uploads/1/3/1/0/131071312/52aa86072528.pdfIn PDF document text
    • http://woneka.zackannfitness.com/uploads/1/3/0/7/130776677/roginurejuxakorepodi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/88578c98-6886-43c2-b39f-5b4fff01392f/86731732724.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fac70384-97ba-44d4-bbf1-477a696a9ffa/5517973022.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e4cf550e-1a57-4f12-8007-af522b74d13a/79104148969.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000041a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x41A7 5176 bytes
SHA-256: 6556d11339063218a3dda8e9381c2a31a21e8ba04740ef9ec5853cc56c223b0c
font_01_sfnt_off00005325.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5325 10244 bytes
SHA-256: c9c25d6ae3ab9768a8326f55c76178c6b339559c3d20534ee489c2b54d7ac92c

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