Malicious PDF — malware analysis report

Static analysis result for SHA-256 aafdb3e97c13cce8…

MALICIOUS

PDF

86.4 KB Created: 2020-12-05 14:20:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: fb3fe766c004cd5e490e52edb5f9500d SHA-1: 72bcc9f680576038b49d935d48c9fe860066128c SHA-256: aafdb3e97c13cce8d388afe0c4c8bece8129001a8d595666ca2d05c657deaf20
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/aws?utm_term=former+astros+catchers+2018'. ML classification and ClamAV also flagged this file as malicious. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool often used to create malicious PDFs. The primary attack vector appears to be directing the user to a malicious external resource.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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/aws?utm_term=former+astros+catchers+2018 In PDF document text
    • https://cdn-cms.f-static.net/uploads/4366360/normal_5f9315baf0ad3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367300/normal_5f8ab68146eaa.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/4c98f453-f295-4a32-8e5e-ed95b17417e5/2518447430.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0e88b8139af0376454bd0/t/5fc5290c3485235c866c1ce7/1606756635182/judakeralekutit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d54b797d-26f6-43b5-8706-51d380989c6d/xotanujoroxilipomelogafe.pdfIn PDF document text
    • https://s3.amazonaws.com/dazemi/axis_football_league_unblocked_at_school.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4ad20360-8fdb-4c27-b227-439493d4d2b6/singer_esteem_user_manual.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0c87788c99b6d37a67a80/t/5fc236e5cb3e0f577199ac07/1606563558421/goodyear_viva_3_customer_reviews.pdfIn PDF document text
    • https://s3.amazonaws.com/rilexazejuzovep/81895039030.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0c93a453-a220-4be7-92a3-c58b7a9c009c/wajapidulum.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc283f51c8c7413143c2872/t/5fcaeda011c29807e6cf3d98/1607134624457/dinojaritamudagofe.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc10d1bea4a794d5645e011/t/5fc5dacbe6d49a06bb5e12de/1606802126505/clases_de_escuela_biblica_dominical_para_nios_de_3_a_5_aos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/67bb1b8e-899e-400f-a5c6-5a29ec1e7eca/bodikakuwabujevujefegob.pdfIn PDF document text
    • https://s3.amazonaws.com/rirusozo/kemubafufupagakuxavudejo.pdfIn PDF document text
    • https://s3.amazonaws.com/xojafemori/5141737796.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_off000110fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110FD 5484 bytes
SHA-256: 332f348ef941bbf5199372a25a154feb12c32bc9bb883487fa910e19f793a8a1
font_01_sfnt_off00012373.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12373 12740 bytes
SHA-256: 893f3d18cdb5913ef2c5a8dbf04463c1e8fa87a37a7a22c16288db7e542c85f7

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