Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5f41c30c2fa3717…

MALICIOUS

PDF

31.3 KB Created: 2020-11-04 03:23:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: b8d28f49b83a2646c15a956c6d25f016 SHA-1: 92bbd31065c14340338233f132a4c2907ce1fb97 SHA-256: b5f41c30c2fa371765685f1d7a74f1a6a071953a89aea047be72acf5341eba74
154 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 disguised as a manual download, which redirects to the malicious URL https://ggtraff.ru/strik. This URL is flagged as a known malicious redirector. The document also contains a large number of links to other PDFs, suggesting a link farm or SEO manipulation tactic. The ML classifier strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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://ggtraff.ru/strik?keyword=brother+1034d+manual+download+english+only In PDF document text
    • https://cdn-cms.f-static.net/uploads/4370744/normal_5f8be417b7082.pdfIn PDF document text
    • https://foruvojupizife.weebly.com/uploads/1/3/4/3/134352799/3612787.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420934/normal_5f9808bf00ff8.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/fefurorobumi/10110541338.pdfIn PDF document text
    • https://s3.amazonaws.com/felasorarabipis/marathi_calendar_july_2018.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/69c91d39-db4d-4cc6-9dc5-bfd94e12c1cb/pathophysiology_made_easy.pdfIn PDF document text
    • https://s3.amazonaws.com/mijedusovineti/poxuveliragegexil.pdfIn PDF document text
    • https://s3.amazonaws.com/voxazedisula/actron_autoscanner_plus_codes.pdfIn PDF document text
    • https://s3.amazonaws.com/jovekus/software_architecture_in_practice_download.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_off00003dbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3DBB 5928 bytes
SHA-256: 5ed76bfcb04740fae580a3927fc03e9a8197d624759f9cd2826891d4e4a9a8ed
font_01_sfnt_off000051e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x51E1 9088 bytes
SHA-256: 27987dec1898113b702bf22f356b86c19f910005a2246b41f5eb4632cc7a33b0

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