Malicious PDF — malware analysis report

Static analysis result for SHA-256 2609b761cabb5f92…

MALICIOUS

PDF

42.3 KB Created: 2020-11-01 08:11:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 42cfd0e99dff1b95afa78e2e32c743ea SHA-1: b27e7537e683d0b6ecbbc36740b268badb951c58 SHA-256: 2609b761cabb5f92ad1064b65d4783acc69215f4260e8a1494bd0c560390a755
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links designed to create a link farm, with a primary redirector URL pointing to a malicious site. The document body, though heavily obfuscated, also contains the same redirector URL, suggesting an attempt to trick users into clicking it for a supposed free download. The ML classifier strongly indicates maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://gettraff.ru/aws?keyword=show+past+tense+in+french In PDF document text
    • https://cdn-cms.f-static.net/uploads/4409000/normal_5f9e27a6b5610.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385634/normal_5f910b1dbb524.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403140/normal_5f97cadb3a5ad.pdfIn PDF document text
    • https://feleluxotikuko.weebly.com/uploads/1/3/4/3/134338959/texiwuj.pdfIn PDF document text
    • https://zufugorutamivas.weebly.com/uploads/1/3/4/4/134401118/6514299.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/pisik/belkin_thunderbolt_3_express_dock_manual.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/8610/1145/files/minecraft_error_placing_order_2020.pdfIn PDF document text
    • https://s3.amazonaws.com/biwubeleba/ragevisuxanedoxotefi.pdfIn PDF document text
    • https://s3.amazonaws.com/tetazino/vocabulary_in_use_advanced_3rd_edition.pdfIn PDF document text
    • https://s3.amazonaws.com/subud/96293854935.pdfIn PDF document text
    • https://s3.amazonaws.com/liwafo/11632092447.pdfIn PDF document text
    • https://s3.amazonaws.com/sugaguxagu/wefibekelalinikokotijukan.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005ab5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5AB5 5056 bytes
SHA-256: b037565e43b2d9907ba6ff059bda2639661694170512b976b26232360328175a
font_01_sfnt_off00006be2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6BE2 10220 bytes
SHA-256: 6c869b90629951c8ad8ccaeccf3400b98fd2a75820b331c64642e32c19e3c81c
font_02_sfnt_off00008ea4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8EA4 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2