Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc8602a7b9155fa5…

MALICIOUS

PDF

53.4 KB Created: 2020-11-05 12:41:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: f5f810645f4e9ba1e53195f1b6fa74c6 SHA-1: 35d75b3188df08e0cd48436ca5cff09a2deb5d5c SHA-256: cc8602a7b9155fa5777eef0972ce02c02906180b198caa511ea888702c0a27c7
204 Risk Score

Malware Insights

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

The PDF document contains embedded links that redirect to malicious infrastructure, specifically identified as a link farm designed for SEO manipulation. The document body, though heavily obfuscated, contains a URL that appears to be part of this malicious scheme. The presence of multiple links to external PDFs and the ML classifier's high confidence score indicate a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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?keyword=army+information+assurance+test+answers In PDF document text
    • https://boguvetasitob.weebly.com/uploads/1/3/1/3/131380850/309006dd.pdfIn PDF document text
    • https://tipefejiri.weebly.com/uploads/1/3/0/9/130969755/9926630.pdfIn PDF document text
    • https://tisatazufewuvo.weebly.com/uploads/1/3/1/1/131163687/3522020.pdfIn PDF document text
    • https://bovitala.weebly.com/uploads/1/3/4/4/134497817/2934858.pdfIn PDF document text
    • https://dizakevusarebiz.weebly.com/uploads/1/3/4/5/134581037/bf5afbd93024740.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/182db824-0dc8-488d-a1e8-60f1a6f27a20/zisibudi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0502/0775/2343/files/22095699420.pdfIn PDF document text
    • https://s3.amazonaws.com/kudefem/rumford_little_league.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3b1dbfcc-0c2e-4f1b-bd62-f50f7ba3bda4/94408069467.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/5867/1015/files/bobivirev.pdfIn PDF document text
    • https://s3.amazonaws.com/nagev/burke_s_pentad_definition.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000851f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x851F 5060 bytes
SHA-256: 51e39041eb257213fd50c934b46c04963dd66f27a1fbc08581f6cc1f743d16ec
font_01_sfnt_off00009648.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9648 10604 bytes
SHA-256: 6ac2786bad5b5687c44d862dbdfc7e816aebb7cc6fab6e4acce3b54d6be31a81
font_02_sfnt_off0000ba61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA61 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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