Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf4b76f628a13d6b…

MALICIOUS

PDF

50.1 KB Created: 2020-07-21 08:28:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d2579c9258ea3f91a923d63d0fabb426 SHA-1: 900f2f7c290633642c6471994803da855688a2eb SHA-256: cf4b76f628a13d6beafe9c256bb7260ef59845f76a377dd331a8fc01c58cab32
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous embedded links, a common tactic for SEO poisoning and redirecting users to malicious sites. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' specifically flags a URL pointing to known malicious infrastructure. The ML classifier also strongly indicates maliciousness, supporting the conclusion that this PDF is designed to lead users to harmful content.

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://ttraff.ru/wb?keyword=grammar%20games%20and%20activities%202%20pdf
    • http://files.idajanelashes.com/uploads/1/3/1/4/131409017/vekowuzupuxixiwav.pdf
    • http://files.makeupjar.com/uploads/1/3/0/7/130775009/71fb7b.pdf
    • http://files.llenise.com/uploads/1/3/2/6/132681322/wefuxotimowunudew.pdf
    • http://files.traceyfox.co.uk/uploads/1/3/1/8/131871994/funufaforaxiromoba.pdf
    • https://cdn.shopify.com/s/files/1/0432/3111/7467/files/28257324006.pdf
    • https://cdn.shopify.com/s/files/1/0428/8105/6935/files/gaxajeni.pdf
    • https://cdn.shopify.com/s/files/1/0430/9201/7305/files/lapisokofurekof.pdf
    • https://livasif.files.wordpress.com/2020/07/susimujubolefesafodifu.pdf
    • https://puxeter.files.wordpress.com/2020/06/9555785594.pdf
    • https://fugesujan.files.wordpress.com/2020/06/leweruvuworixonikilajesow.pdf
    • https://pekizov.files.wordpress.com/2020/06/7768628413.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/51191810805.pdf
    • https://cdn.shopify.com/s/files/1/0436/4248/6934/files/pebupimurabetiv.pdf
    • https://cdn.shopify.com/s/files/1/0427/6636/8935/files/lorubi.pdf
    • https://cdn.shopify.com/s/files/1/0430/4044/0471/files/585101630.pdf
    • https://cdn.shopify.com/s/files/1/0432/1948/4839/files/suvuvaxe.pdf
    • https://cdn.shopify.com/s/files/1/0432/6028/0982/files/22712598763.pdf
    • https://cdn.shopify.com/s/files/1/0430/6308/3162/files/dujetewalomudezi.pdf
    • https://cdn.shopify.com/s/files/1/0431/7016/8986/files/bolaxoxumilelunogaxi.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000085f6.bin
4f3c277fc6fac20ab83f2969ce65dd2e1e4eca1cf3437c3187712f76b82d4857		 pdf-font-stream PDF embedded font (sfnt) at offset 0x85F6 5344 bytes
font_01_sfnt_off00009818.bin
8cd0b5621f0dac21e2958ab57c31b9058d666ab997cecf1e180cbfd033b83ed0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9818 10060 bytes

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