Malicious PDF — malware analysis report

Static analysis result for SHA-256 a52755ce4b4e49e8…

MALICIOUS

PDF

68.0 KB Created: 2020-11-22 10:48:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 2b1f22d7f6afdbc865655c397c85900c SHA-1: a35444c5658eac3681347bb61b078d2f045cbbc5 SHA-256: a52755ce4b4e49e81febd40059d32da2c35451492d3b40d55b3b4e8312fbff3b
214 Risk Score

Malware Insights

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

This PDF file was flagged by multiple critical heuristics, including ClamAV and an ML classifier, indicating malicious intent. It contains a link to a known malicious redirector, traffmen.ru, which is likely used to funnel victims to phishing or malware sites. The document also exhibits characteristics of a PDF link farm, with numerous embedded links to external PDFs, suggesting an attempt to manipulate search engine results or distribute further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://traffmen.ru/123?utm_term=dragon+quest+11+best+skills+for+rab In PDF document text
    • https://datagoso.weebly.com/uploads/1/3/4/7/134718767/deduwuzixafabuj-nujizi.pdfIn PDF document text
    • https://zosevozosi.weebly.com/uploads/1/3/4/5/134527099/1704151.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/8d20d63f-ce06-400d-82cb-546ba233382c/torosojedaxa.pdfIn PDF document text
    • https://s3.amazonaws.com/tunenijexe/google_maps_usa_satellite_view.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f27c82c8-1a94-46f8-8e62-df191198201e/9048189749.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9e414d8b-5400-4d99-9349-8e3ad4474158/quake_mission_pack_3.pdfIn PDF document text
    • https://s3.amazonaws.com/gajakelegeza/endoscope_camera_for_android_phone.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e7a225cd-6056-48c0-a637-263faccd666c/jesuit_high_school_dallas_football_scores.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e122612f-83eb-4f55-a3a4-5b5158696136/nukowelivutelumetuwironib.pdfIn PDF document text
    • https://s3.amazonaws.com/fajixe/61670306032.pdfIn PDF document text
    • https://s3.amazonaws.com/mekonulegipero/le_petit_nicolas_le_bouillon_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/669b02aa-93f3-4597-bbe3-8be7544af13b/55139433089.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3ba731c2-2511-40a1-ad54-76ee667341b3/tikutakaxujamej.pdfIn PDF document text
    • https://s3.amazonaws.com/xakapudakadu/monolobuvalazexinuzed.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_off0000cb3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB3F 5316 bytes
SHA-256: 6e40b547e0b3b7a88604639181cf7db78f4c5e61d750ae170076be569f3664a4
font_01_sfnt_off0000dd73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD73 11644 bytes
SHA-256: 8360da2be79e700f9b66619f0154764496c9432fe65ab8cd1756af4212758f0b

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