Malicious PDF — malware analysis report

Static analysis result for SHA-256 adae86af3eaac79b…

MALICIOUS

PDF

65.7 KB Created: 2020-11-25 05:45:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 4118beeb9971523dd0d1fc9e1951f60d SHA-1: bdc3a1a38e716833746a036f58e3d5c56888e3e8 SHA-256: adae86af3eaac79b2aade16b89415c7aa9bb19d2f27af6d94af6194cd74aeeac
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 link that redirects to malicious infrastructure, as indicated by the 'PDF_MALICIOUS_REDIRECTOR_LINK' heuristic. The document body, though heavily obfuscated, contains text suggesting a lure for an "answer key", which is a common phishing tactic. The presence of numerous external PDF links also suggests a link farm, potentially for SEO manipulation or to host further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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/strik?utm_term=auto+fundamentals+12th+edition+answer+key In PDF document text
    • https://sigakoge.weebly.com/uploads/1/3/4/4/134437147/b44aa747a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447433/normal_5f9f6f289eb2a.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/45a78d3c-38b1-465c-9806-9154fe9e0208/22889111016.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5d54b51d-26fe-4c18-b98c-3a4c3abe66ee/robotoolz_vector_3.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6478a28b-3e66-4cd0-9c10-cde6e4bd7818/94077899069.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ed159be1-796b-430d-ae6a-735d0b1bf2c8/wuwulijixajotekivofozemi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/36a7fcf0-95fd-4921-81c1-c6847b376a2b/cc3d_openpilot_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3b3b3f63-09e5-434c-b86c-ab38d79931ce/88373531274.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b7b69ad5-8ea5-4328-b48b-db118240a45b/61686113506.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_off0000c289.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC289 5576 bytes
SHA-256: 45a49720c33a46236db351278da2b92fa759f3fb3108b72fc2e84316732cc93d
font_01_sfnt_off0000d575.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD575 10812 bytes
SHA-256: a209e8df235940c921dda86dc8ba440c25f363295978181b64fa5250f32d5d3a

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