Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5bd8e229e4f6bdb…

MALICIOUS

PDF

38.9 KB Created: 2020-10-03 06:52:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: ee31533b66303196355b608596c165e0 SHA-1: 8c653d4d482c41e79210e2772464d04917bf51ed SHA-256: a5bd8e229e4f6bdb61680385c54cd5b2fbe5c88818ea36830e11ac76bfbd1e12
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a large number of embedded links, many of which are designed to appear as legitimate resources but ultimately redirect to the malicious domain 'cctraff.ru'. This indicates a link farm or SEO poisoning attack, aiming to drive traffic to malicious infrastructure. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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=adjektivdeklination+akkusativ+%25C3%25BCbungen+pdf In PDF document text
    • https://site-1039380.mozfiles.com/files/1039380/gidunelabobojenixoge.pdfIn PDF document text
    • https://site-1037160.mozfiles.com/files/1037160/28791803870.pdfIn PDF document text
    • https://site-1039784.mozfiles.com/files/1039784/jufogimazavevaradajujemo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0488/9644/2527/files/84432027134.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/9918/4551/files/80740173317.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/6352/5029/files/titan_440_classic_manual.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/4513/3207/files/minecraft_halo_mod_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1dd72364-6bbd-47cf-911a-4c295a51d834/wulitinoveg.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b8ca8601-00e5-4cfb-83d0-2a1a27701192/pivulewenobim.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e6d12488-7dcb-4751-8ba6-acfa3aa0e032/42334339515.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ebeea17d-7226-4bab-b3bd-32a45a28e453/sodunesiwutov.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bd7ab38e-8939-4d42-9a2d-e4c5a3ec233f/18852365026.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b9239218-7045-4540-b5dd-17ef00c3e956/46780553084.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/00a421da-d601-4076-a68a-137c23250aec/madukebomage.pdfIn 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_off00005ea6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5EA6 5564 bytes
SHA-256: 3408a2094cd349dfd253b01ef43e0ec0812815f274ec16a8b205485a3736bb36
font_01_sfnt_off00007181.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7181 10912 bytes
SHA-256: 677cc962c026145682c576ecf024020f70cbe18a49a3ac86535a3886f47cf712

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