Malicious PDF — malware analysis report

Static analysis result for SHA-256 720cd81a2fcd1813…

MALICIOUS

PDF

68.1 KB Created: 2020-12-17 00:02:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 36317d7618801dfabe2a88de6a40dbf0 SHA-1: 421984ca7908e394450a11a63ac429f76674c6c1 SHA-256: 720cd81a2fcd1813679c8cde787cc1f060a0ff3059b5210811889b304e26caa4
244 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by multiple heuristics and a machine learning classifier, specifically flagging it as a redirector link farm and a phishing trojan. The document contains numerous embedded links, many pointing to disposable hosting services, designed to lead users to malicious or unwanted content. The presence of a link to 'gettraff.ru' further indicates a redirection attempt to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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/123?utm_term=espn+30+for+30+broke+worksheet+answers In PDF document text
    • https://xavabakonoliwif.weebly.com/uploads/1/3/4/4/134477423/ketol_wugukoguler_xebek.pdfIn PDF document text
    • https://witudaki.weebly.com/uploads/1/3/4/3/134332653/puxaj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377933/normal_5f914783c45e0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388608/normal_5fba9636358b2.pdfIn PDF document text
    • https://lidusibujoxoxo.weebly.com/uploads/1/3/4/5/134500869/7738464.pdfIn PDF document text
    • https://pevusipifo.weebly.com/uploads/1/3/4/8/134863194/tiwiwew.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373502/normal_5f8ceeda445c8.pdfIn PDF document text
    • https://galojegada.weebly.com/uploads/1/3/4/3/134364802/wadarazona-midenapigebekip-xupox.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367277/normal_5f9226c6c5023.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371258/normal_5fd27d02cbc4b.pdfIn PDF document text
    • https://bedizegoresupa.weebly.com/uploads/1/3/1/3/131379398/5473886.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/degisapemifa/allegiant_full_movie_openload.pdfIn PDF document text
    • https://s3.amazonaws.com/xuxifuzituwu/felicity_farseer_fsd_guide.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_off0000cd3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD3F 5516 bytes
SHA-256: e64db139fa523ad4ce48941788cec90d2e52ba80b9d31679bcfa3a3a779b3b67
font_01_sfnt_off0000e011.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE011 10468 bytes
SHA-256: 6436a99a607220e233265029f9f4945785a7990755e2c4031ff054e2386be627

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