Malicious PDF — malware analysis report

Static analysis result for SHA-256 550bf354051ecad8…

MALICIOUS

PDF

73.4 KB Created: 2020-12-26 09:23:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 72448f91d05eededc842405b81f6dec8 SHA-1: 94d3d337d9127eb9d84614b6552aa2f00345a6c3 SHA-256: 550bf354051ecad83140ed1487b4d099df920efcfd5fadbdc9cf3d8e13019481
154 Risk Score
Tags
free-cdn-ebook-manual-lure

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://cctraff.ru/aws?utm_term=acute+stroke+guidelines'. This URL is likely used to lure the user to a malicious site. The ML classifier also strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the nature of the redirector suggests an attempt to deliver a payload or phish credentials.

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://cctraff.ru/aws?utm_term=acute+stroke+guidelines In PDF document text
    • https://cdn-cms.f-static.net/uploads/4418796/normal_5f9884b573032.pdfIn PDF document text
    • https://cdn.sqhk.co/masamiwe/hejfD7O/twisted_sister_lead_singer_now.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374177/normal_5f96481a2ea55.pdfIn PDF document text
    • https://cdn.sqhk.co/muxigatatini/8RHO8hi/airport_scanner_images_hot.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/d6b70ca2-f9cf-4177-ab25-ae2fbf6f8706/guitar_hero_3_lou.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/afd3eb04-897f-4828-a6f6-5673b47846ef/saben.pdfIn PDF document text
    • https://s3.amazonaws.com/zuwimadaneb/guitar_part_names_acoustic.pdfIn PDF document text
    • https://s3.amazonaws.com/zaxuledo/filmywap_2016_movie_mastizaade.pdfIn PDF document text
    • https://s3.amazonaws.com/bakoloj/adventures_of_tintin_movie_english_subtitles.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/85ec0d79-9a82-4946-9435-81594f1472a4/30169334078.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/801223ee-8596-4c1f-9983-5f5c132a2065/king_cold_location_dbz_kakarot.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f0d7ad75-a08a-4321-8d31-4bd0e3cb35f2/83192395837.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c982fd0c-5b4f-47c7-88cf-9e6217599207/48436148665.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_off0000e49f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE49F 4948 bytes
SHA-256: 8ef4f416811c4f1e0be3729d243f47b894cac7e332332b051504d992796bdb6f
font_01_sfnt_off0000f58b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF58B 10336 bytes
SHA-256: 7a298de0c8c230f9adb93183df78328a70858d53076f7ff3621177c84a0f91a6

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