Malicious PDF — malware analysis report

Static analysis result for SHA-256 16baef8d461b4dec…

MALICIOUS

PDF

64.4 KB Created: 2020-08-08 09:22:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f05d9f08a269a07fceb803a7c8c864f6 SHA-1: ce8b45177641cac32d08e41e0ed02d6c3c3d0cae SHA-256: 16baef8d461b4dec36c0fe98016f98bedd3a55a29f00a8df2e871aba4da32d85
154 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for malicious redirector links, pointing to ttraff.com. It also exhibits characteristics of a link farm, with numerous external PDF links, many of which are benign Shopify links but others are unknown. The document body, though heavily obfuscated, contains the malicious URL and text suggesting a lure. The ML classifier strongly indicates 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.com/pify?keyword=brainstorming+definition+pdf
    • http://tixuwe.multipleconstruction.com/uploads/1/3/1/8/131856772/zaket.pdf
    • http://files.haulksmaple.com/uploads/1/3/1/4/131454620/pebivowus.pdf
    • http://gobamefo.daddysmoneymarketgoats.com/uploads/1/3/1/6/131637136/8c8d82b3e7b87.pdf
    • http://gudob.pittsburghrunner.com/uploads/1/3/2/6/132683014/suxiposadanasevesiz.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0427/9032/2335/files/lokefixir.pdf
    • https://cdn.shopify.com/s/files/1/0430/5901/9927/files/92900502025.pdf
    • https://cdn.shopify.com/s/files/1/0433/7857/3464/files/56892182267.pdf
    • https://cdn.shopify.com/s/files/1/0436/4173/3273/files/60468172497.pdf
    • https://cdn.shopify.com/s/files/1/0432/3685/1874/files/95262384747.pdf
    • https://cdn.shopify.com/s/files/1/0431/7102/0954/files/fupalupasub.pdf
    • https://cdn.shopify.com/s/files/1/0431/8153/9489/files/business_communication_essentials_6th_edition_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0431/3320/6690/files/44301920492.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/wexidemunuviviradepinitim.pdf
    • https://cdn.shopify.com/s/files/1/0430/4352/0666/files/68820713859.pdf
    • https://cdn.shopify.com/s/files/1/0435/6869/3411/files/kobisupubemoti.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_off0000be6e.bin
67c142c307eb7f7e35d89c0a30261048e20a7869e819cb9af266284ad874acda
pdf-font-stream PDF embedded font (sfnt) at offset 0xBE6E 5380 bytes
font_01_sfnt_off0000d0a7.bin
66fd848b7f0e8acb49c1000b09f0d89273426bfae102a86eb4459c7ae9dfb965
pdf-font-stream PDF embedded font (sfnt) at offset 0xD0A7 10488 bytes