Malicious PDF — malware analysis report

Static analysis result for SHA-256 76491977e8467a96…

MALICIOUS

PDF

67.3 KB Created: 2020-12-04 04:00:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 7e398d6f0614e3cde62db3a3b113ea81 SHA-1: d0bed5c92b0915604117cb639f0d02d47480580c SHA-256: 76491977e8467a96c19cf9ad24f05becd924829e7c0107d35d3fa721d1c8b4b4
162 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 'traffking.ru'. This URL is presented within the document body, likely disguised as a download button, as indicated by the 'SE_DOWNLOAD_BUTTON' heuristic. The ML classifier also strongly flagged this PDF as malicious. While no scripts were extracted, the presence of a malicious redirector URL strongly suggests an attempt to deliver a secondary payload or phish credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://traffking.ru/aws?utm_term=best+fillable+5e+character+sheet In PDF document text
    • https://cdn-cms.f-static.net/uploads/4377924/normal_5f9c3cef7532c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457839/normal_5fb012913a0ac.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451377/normal_5fbc1e6d4c9d4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/fd0b05fd-1534-4acf-acb7-10231941db1d/chemistry_a_molecular_approach_4th_e.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bd353fd6-1595-49b4-b479-91402f8d5d16/gawawidujemubenekekolif.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/87e37d72-0de8-465b-b672-b0fa5b5cd0e8/zoduvofodilolijif.pdfIn PDF document text
    • https://s3.amazonaws.com/naxizugenabi/balance_sheet_example_non_current_assets.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8650fce1-f455-48ee-bad7-a8e9e2a6b92c/introduccin_a_la_psicologa_social.pdfIn PDF document text
    • https://s3.amazonaws.com/livivuvuwugeb/tagodufelurel.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fbaa345d-2df2-40fd-b630-33645f9268c3/touhou_fighting_game.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a11bf6dd-b83f-4f1d-96ae-f1f59174d9ce/pililizonud.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1acbb31a-50e3-4576-885c-fe5c2e5416c8/german_article_daily_crossword_clue.pdfIn PDF document text
    • https://s3.amazonaws.com/patotale/fovepij.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_off0000cbba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBBA 5280 bytes
SHA-256: 67ef7bec4fc689c24ec0de30ff9cb1d0e206c7897a57e86a1d4e94ada8b4833a
font_01_sfnt_off0000ddb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDB2 10112 bytes
SHA-256: acd386014679951700b60e113ee99a216fb3b97620b90f0da3d72d9e93b3a7cd

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