Malicious PDF — malware analysis report

Static analysis result for SHA-256 a08dd3b335a1452e…

MALICIOUS

PDF

32.3 KB Created: 2020-10-03 11:42:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 19a798f2b8e3de73299bc7f69df644fe SHA-1: df43f3de00792be003c021655032ddf072fb6c2c SHA-256: a08dd3b335a1452ed9d8fdf99858ef8f219955e67c03f415f96a82eb9aa7ea2c
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with one identified as a known malicious redirector. The ML classifier also flagged this PDF as malicious. The document body and embedded links suggest an attempt to direct users to potentially harmful external sites, possibly for phishing or to serve further malware. No scripts were extracted, but the PDF structure itself facilitates the malicious redirection.

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://cctraff.ru/strik?keyword=walkera+36+parts In PDF document text
    • http://sumilig.guadalupecafe.com/uploads/1/3/0/7/130776485/8554245.pdfIn PDF document text
    • http://files.cotuithistoricalsociety.org/uploads/1/3/0/8/130874488/dixefadazufigovif.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/0f21fefe-be13-43e1-af50-dffe1d6935ed/rodetasidud.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bb71885a-d045-4f7a-beda-3437be342e17/14002939975.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/02eebcb9-323c-4add-8883-e5b56d749528/19195735522.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f2fbe022-24ca-4f40-802d-e20fb89946fc/xonumiwumuduboripafatuji.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/28666987-3a25-4295-b193-46791ab9e6b8/dumagefod.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a341e4d7-0b49-4c54-9c3b-a972d4e289d6/juxajakamakiwanutetuwap.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cc5f9a04-66cb-4375-92ca-c022d5555bb5/xazuvisikulem.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3c99f882-baa3-4203-b36c-eff51211440c/80597318173.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_off00003fda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3FDA 5208 bytes
SHA-256: 51302f1133eb461c8aa7f90ac483f7a394000881605cbcc96b8e716a973dfcce
font_01_sfnt_off000051aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x51AA 10480 bytes
SHA-256: 8d22373ff272dc565b1075903726deeece92e2b9753534a3d759425e3deb36f6

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