Malicious PDF — malware analysis report

Static analysis result for SHA-256 31a2fbf93feb2ff5…

MALICIOUS

PDF

76.0 KB Created: 2020-11-23 14:57:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1016330cc7256cd9aa5f9e13dbcf214d SHA-1: b3d39e6198587810ebfb016ea586cbf82e7d4818 SHA-256: 31a2fbf93feb2ff5dea565fb0693b8ac1791eb9b412fc243b9f40bfcff6e89d7
214 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical finding for linking to known malicious redirector infrastructure. The document contains a large number of embedded URLs, likely for SEO manipulation or to lead users to phishing or malware sites. No scripts were extracted, but the presence of numerous external links suggests an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://ggtraff.ru/123?utm_term=munford+high+school+alabama
    • https://cdn-cms.f-static.net/uploads/4500446/normal_5fbabfa371eeb.pdf
    • https://pafetinavip.weebly.com/uploads/1/3/4/8/134868030/c4fe56.pdf
    • https://cdn-cms.f-static.net/uploads/4382958/normal_5f8d03c6492c8.pdf
    • https://cdn-cms.f-static.net/uploads/4372987/normal_5f8af125053cc.pdf
    • https://rasuzumiketasak.weebly.com/uploads/1/3/4/3/134393825/vavibal-rewag.pdf
    • https://senovetesu.weebly.com/uploads/1/3/4/7/134710525/xopirulutem_luranetekake_demene.pdf
    • https://cdn-cms.f-static.net/uploads/4379844/normal_5f8e7352f0b59.pdf
    • https://laguwiba.weebly.com/uploads/1/3/4/7/134719839/levovamasumopataluj.pdf
    • https://cdn-cms.f-static.net/uploads/4419630/normal_5fb9cf7612b00.pdf
    • https://xitukuwelup.weebly.com/uploads/1/3/4/3/134340625/74e88eb3ff4c.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/f3dd6b83-7092-482c-92b7-89102090298c/what_is_life_a_guide_to_biology_2nd.pdf
    • https://uploads.strikinglycdn.com/files/5cc4e438-e280-4a01-b2f3-379ad8960794/44447965016.pdf
    • https://uploads.strikinglycdn.com/files/58d8c8c5-9447-44f6-9102-23683a15127c/yeux_daigle_photos.pdf
    • https://uploads.strikinglycdn.com/files/a4c47be6-5b48-4677-a9e9-709927dc160f/71729810878.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_off0000ec3f.bin
c10f67678b7cddd82344f4c932db08108283c48d1c9f17b907beb568393c77ab		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC3F 5580 bytes
font_01_sfnt_off0000ff1f.bin
e70c58eb5f580f171f303493b9133d340b2694e4bd593877e5b2e3a0e158d136		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFF1F 10656 bytes

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