Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc4ec5b1cf5e6f46…

MALICIOUS

PDF

60.8 KB Created: 2020-12-18 02:42:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 251628332aa7ef46b978d3b2328d9107 SHA-1: bac16b6f0e77fbb96b2f9800da1cfa3b76afe666 SHA-256: fc4ec5b1cf5e6f469f393aa5213108f82b60be5791a0babe56e92ec8707d5c6c
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://gettraff.ru/strik?utm_term=oakview+middle+school+andover+mn'. This indicates the document's primary purpose is to lure the user to this malicious URL. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the presence of a malicious URL is sufficient evidence for a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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?utm_term=oakview+middle+school+andover+mn In PDF document text
    • https://cdn-cms.f-static.net/uploads/4486763/normal_5fc1d8a49f9c2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464734/normal_5fb84187451e3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402501/normal_5f94dd414e058.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/fuwenoxuzasila/aasthulu_anthasthulu_naa_songs.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0e526c6229360ecacefcf/t/5fc156a8f81c9a2a0cd4025b/1606506153440/70114753754.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c001efdf-9967-470d-a7e5-a29b83fc72e8/ramamiji.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc589c6405d5340f34924f2/t/5fcc1bec7ae85b53b28086dd/1607212012305/escape_the_prison_game_cheats.pdfIn PDF document text
    • https://s3.amazonaws.com/zonivezada/xivemijitojigixiba.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6733518e-71b2-49c4-af92-f604c177596d/39518404691.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0c356a13a450babf351fc/t/5fc1c4cb145a8629dcf26e36/1606534347688/what_is_function_notation_in_algebra.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dccb8979-a511-4da0-b7c0-edee0cacc708/faxuror.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0fc92ec917750a3d858a5/t/5fd1b6c9f2ee360040f7cc30/1607579337922/81314484304.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_off0000b09b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB09B 5420 bytes
SHA-256: 48376fc5162800f337b578cfd8b07f22aa20704e539ef048f39b48e1efaeeb43
font_01_sfnt_off0000c2f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2F6 10712 bytes
SHA-256: a58693367f131ad6f0007ec627f21da57bd2c145ef5a6e98a1ca5eab6575582d

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