Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9ad51fbc03888e1…

MALICIOUS

PDF

62.9 KB Created: 2020-11-23 02:40:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 9c202ce02d3fcb3b20ff9b7df04bddc9 SHA-1: 9e0ab357b4028cc90b059e4d38e0eef84aec350b SHA-256: a9ad51fbc03888e1300995c2bb2657760373288131f25ab6a8c1c3139dc2743c
214 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 for a malicious redirector link pointing to 'cctraff.ru', and another for a link farm. ClamAV also detected it as 'Pdf.Phishing.Trojan'. While no scripts were explicitly extracted, the PDF structure and malicious links strongly suggest an attempt to redirect the user to a phishing or malware hosting site, likely as a spearphishing attachment.

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://cctraff.ru/123?utm_term=the+essential+life+book+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4383302/normal_5fb77f2dd81d0.pdfIn PDF document text
    • https://gusumadanu.weebly.com/uploads/1/3/2/6/132695601/5053670.pdfIn PDF document text
    • https://ponixojezunuto.weebly.com/uploads/1/3/0/9/130969897/memazisuzixuvazekaro.pdfIn PDF document text
    • https://tojaluteder.weebly.com/uploads/1/3/4/3/134384479/fafonuroke.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/f161a0a9-d91d-490e-8433-0397fff1f13d/7734176581.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/996b6338-5742-441c-bce4-0c203f69fb9d/bivediwumerukile.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/31218500-fd59-49a3-976f-e93fa6d25e6b/64533940305.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0593e346-ce51-4cbd-9174-176c8387b6c4/18991917004.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/360c4d90-43e0-40d0-b87a-3273aaa2a6e9/crop_top_and_pencil_skirt_set_online_india.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/95dc1e3c-efc3-478f-a1c9-de92fefe6c2d/11511527920.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e0c7ed5e-0c87-4486-8db4-582f4dd5599b/rejujiwejugoki.pdfIn PDF document text
    • https://s3.amazonaws.com/henghuili-files/36162847041.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9792b805-f926-4eeb-88b2-a6ee149befe0/kinaper.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/151e4b78-749d-48fd-9ff8-ad890230c1f9/16889645654.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

Related samples 5

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b974.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB974 5184 bytes
SHA-256: fcf46438ce553df0ff165e1ae9df59f7868b213998a1615ed5c33bd1744eb279
font_01_sfnt_off0000cb10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB10 10608 bytes
SHA-256: b7f3e4f4c7235665a67660b8d5e708301708edf741509333f18c4c7a13cc05d3

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