Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfcd4375925a6f22…

MALICIOUS

PDF

86.1 KB Created: 2020-12-15 01:14:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 4900e7cbc328f120b6a597600efac216 SHA-1: 59d981f9b8aa046e14a9fddbf6310602fbf2508a SHA-256: bfcd4375925a6f226b11fcd0504af45bb0306033427d34a17b4d0d1b2801da24
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing indicating a malicious redirector link to 'https://gettraff.ru/123?utm_term=aa+step+3+exercises'. The ML classifier also strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the presence of a malicious URL within the document body suggests an attempt to lure the user to a compromised site, consistent with phishing or malware delivery via a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • 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.
  • 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=aa+step+3+exercises In PDF document text
    • https://cdn-cms.f-static.net/uploads/4367299/normal_5fb73e62b1532.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/ziwuvijevo/8242602259.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc5523bd26ff1194f913b76/t/5fc79a384f9413233b2689bc/1606916666802/picotin_18_hermes.pdfIn PDF document text
    • https://s3.amazonaws.com/wipotegadodorek/mibivodawavijakol.pdfIn PDF document text
    • https://s3.amazonaws.com/kofabube/70097511042.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ba69d909-c0b8-4e76-8333-9dbfe0813013/homeless_by_anna.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc5ada1c89e1c4b8fdf3d5c/t/5fc9fd7481b71b40859ab6c3/1607073140841/hexonia_free_tribes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1277aa49-b6b4-4165-8d43-1ead4400d81e/72608622349.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/be333124-0c17-4092-a255-b9d715624d59/2.2_the_war_for_independence_worksheet_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/rewepalazamiso/basic_calculus_grade_11_deped.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dec6e640-983f-4d38-8f75-ffc7c05b8761/kexuwuritimeko.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_off0001149f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1149F 5116 bytes
SHA-256: 7416145620ab5291d7ba340292e15017571dcb66946d0b093914a0d5188efb8a
font_01_sfnt_off0001261a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1261A 10908 bytes
SHA-256: b18df42446a9a80f3ef4d8767dd44379674339ca55bccebe920053470115917e

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