Malicious PDF — malware analysis report

Static analysis result for SHA-256 0e80c55e10dcb8be…

MALICIOUS

PDF

40.2 KB Created: 2020-08-31 03:59:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bb578a7f45dbfd73d0f07cb80c4d6d10 SHA-1: 7f13455e8b6e0552c748630f4eaef27934dda464 SHA-256: 0e80c55e10dcb8bebaa46f4297f76e735c04f86d24fc34952b35dbd4af6aeb2e
154 Risk Score

Malware Insights

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

The PDF contains embedded links that point to a known malicious redirector, which in turn leads to a link farm of other PDFs. This suggests an attempt to manipulate search engine results or distribute malicious content through a network of linked documents. 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://ttraff.ru/wix?keyword=play+flowerz+game+free+online
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/df4650_2ffe31b0d9424a6d8e541a7c344b3dd7.pdf
    • https://static.usrfiles.com/ugd/b8c837_9152adba514f4e8fa39da77a059d4bd7.pdf
    • https://static.usrfiles.com/ugd/b8c837_75560a67bc894a448044a18ddd58077f.pdf
    • https://cdn.shopify.com/s/files/1/0448/5398/5442/files/vofojutonakure.pdf
    • https://cdn.shopify.com/s/files/1/0428/3577/1558/files/wirewomipuvexiviwa.pdf
    • https://cdn.shopify.com/s/files/1/0440/8259/3957/files/53463404357.pdf
    • https://cdn.shopify.com/s/files/1/0427/5788/2022/files/37023672668.pdf
    • https://static.usrfiles.com/ugd/b8c837_24929345fbb940dbb2dee78f07c4ccf0.pdf
    • https://static.usrfiles.com/ugd/b8c837_fa1fb0994d5642f8a7a4401336d38efe.pdf
    • https://cdn.shopify.com/s/files/1/0434/4794/3330/files/yarn_clear_cache.pdf
    • https://cdn.shopify.com/s/files/1/0435/4464/1695/files/zutapijulisipizovifab.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_off00006101.bin
9be8ee06ae133d8073baf94c7c5b2e8732c80d5f0f8ce1c8d3be39160781e781		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6101 5152 bytes
font_01_sfnt_off0000729a.bin
b2a3c8df21abfcda145617e4ffa4833d6fa2e1eecd473155b89f768419283eec		 pdf-font-stream PDF embedded font (sfnt) at offset 0x729A 9904 bytes

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