Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ffd3ca92a7082f7…

MALICIOUS

PDF

36.0 KB Created: 2020-10-31 19:37:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a10a011311f5a8199990173993430e3d SHA-1: dd65337f72c30231a4d494a590f18cbceca23f34 SHA-256: 7ffd3ca92a7082f70455cc641fe41873991086b0709cf63a17942143e42c74e8
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a significant number of embedded links, many of which point to a link farm designed to redirect users to malicious infrastructure. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK specifically identified the URL https://cctraff.ru/aws?keyword=kidde+co2+alarm+manual as a known malicious redirector. The ML classifier also 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://cctraff.ru/aws?keyword=kidde+co2+alarm+manual
    • https://cdn-cms.f-static.net/uploads/4366008/normal_5f871162f2d6d.pdf
    • https://cdn-cms.f-static.net/uploads/4375907/normal_5f8d971915c93.pdf
    • https://jurizimobijagi.weebly.com/uploads/1/3/0/8/130874317/f170af.pdf
    • https://dajapofijakaf.weebly.com/uploads/1/3/4/2/134266914/dokuribajemaxo_denuwivefesuta_xoxukoru_rovujunakig.pdf
    • https://cdn-cms.f-static.net/uploads/4369766/normal_5f97e2dc4af01.pdf
    • https://cdn-cms.f-static.net/uploads/4369185/normal_5f8e3e7e3f81c.pdf
    • https://cdn-cms.f-static.net/uploads/4382643/normal_5f8b636d988ed.pdf
    • https://dikoriwapajok.weebly.com/uploads/1/3/4/4/134447187/vipovolod_kolegimisu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/kavalukato/81992954043.pdf
    • https://s3.amazonaws.com/nuxulikiwab/dunopovumazirunedil.pdf
    • https://s3.amazonaws.com/henghuili-files2/how_to_calculate_cable_size_for_motor.pdf
    • https://s3.amazonaws.com/jasadavebaga/chabahar_port.pdf
    • https://s3.amazonaws.com/muvojugejoxip/87215246876.pdf
    • https://s3.amazonaws.com/fasanag/the_core_values_of_brotherhood_of_st_laurence.pdf
    • https://cdn.shopify.com/s/files/1/0431/6980/8535/files/online_to_doc_file_convert.pdf
    • https://cdn.shopify.com/s/files/1/0428/5304/0295/files/sushi_roll_maker_instructions.pdf
    • https://s3.amazonaws.com/nezanurugega/pirifurokikad.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000514d.bin
44cf577a4fa2833d13f93761657065ea7f2b8d08e8d8bab77232185c97d9fb8a
pdf-font-stream PDF embedded font (sfnt) at offset 0x514D 5008 bytes
font_01_sfnt_off00006243.bin
fa931b178d0974c3e2a333950292f4f8ddf084112ba3be92bd95b0242112e1ec
pdf-font-stream PDF embedded font (sfnt) at offset 0x6243 9628 bytes