Malicious PDF — malware analysis report

Static analysis result for SHA-256 e499e1ccf35a5d85…

MALICIOUS

PDF

74.8 KB Created: 2020-12-04 14:32:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: e24a5d87ab9fac3355644c34f15bd6f1 SHA-1: 1f2c234ef2fc78cffa44854e37c845fac1fb5c33 SHA-256: e499e1ccf35a5d8592653f7573cd736df0b3bfbd5a37502204e63946917ea245
214 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to `https://cctraff.ru/123?utm_term=fnaf+world+game+free+unblocked`. This URL is likely used to redirect users to a phishing or malware-hosting site. The presence of a large number of external PDF links, many hosted on S3 buckets, suggests a link farm or SEO poisoning tactic to drive traffic to malicious destinations. The ML classifier and ClamAV detection further confirm the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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.
  • 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://cctraff.ru/123?utm_term=fnaf+world+game+free+unblocked In PDF document text
    • https://warisizapot.weebly.com/uploads/1/3/4/8/134871943/favunarodizufer-ravepi-kowugefate.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/batoragubukepo/47810931275.pdfIn PDF document text
    • https://s3.amazonaws.com/zozuxukoxo/33779513734.pdfIn PDF document text
    • https://s3.amazonaws.com/xuxifuzituwu/kebofofagefomidikerokad.pdfIn PDF document text
    • https://s3.amazonaws.com/xubifupi/63997176353.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/feeb4ad1-3146-48dd-b908-ab6eb040b1c2/juxogoludaragavozobow.pdfIn PDF document text
    • https://s3.amazonaws.com/vibasujefir/jusapururu.pdfIn PDF document text
    • https://s3.amazonaws.com/fazujo/52543713785.pdfIn PDF document text
    • https://s3.amazonaws.com/nowonovege/94433165127.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7c040140-7235-42e4-93db-6e7b5ec8799c/pozavatudafirudasimuwoba.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_off0000e7ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7EE 5412 bytes
SHA-256: 742267d09783af9ec6f739ab9daf95a6038582235a62ed5442ac14c2fc632551
font_01_sfnt_off0000fa60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA60 10636 bytes
SHA-256: d55c49e3d5432adb46ef8b6b8cc563e7f6d1b4259d32b22f508b4a976a765a7c

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