Malicious PDF — malware analysis report

Static analysis result for SHA-256 164069878078ca58…

MALICIOUS

PDF

77.8 KB Created: 2020-08-12 12:09:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fdfc4871cfb0187fea1b621f9e76576d SHA-1: a0b6fcde3110775441b2e97870446e548b37b0f7 SHA-256: 164069878078ca583cc8afd86edc1c3277a4475c2091fe1244aecae3163c9746
154 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with one specifically pointing to a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains a URL that mirrors the one found in the heuristics, suggesting a coordinated effort to direct users to malicious content. The presence of numerous external PDF links further supports a link farm or SEO poisoning tactic.

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.cc/wb?keyword=hodges%20model%20theory%20pdf
    • http://files.herewoodsart.co.uk/uploads/1/3/0/9/130969465/duderesupisawe-zumubuputuzuxi.pdf
    • http://files.sharonlewis.net/uploads/1/3/0/7/130740231/nubakadabulagevilag.pdf
    • http://files.rijkewijnen.nl/uploads/1/3/1/0/131070051/4cffec169e.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0429/2476/9436/files/pabekisanokawate.pdf
    • https://cdn.shopify.com/s/files/1/0433/7578/8182/files/levixadej.pdf
    • https://cdn.shopify.com/s/files/1/0427/4470/9276/files/26052980694.pdf
    • https://cdn.shopify.com/s/files/1/0432/9403/2040/files/ranaxo.pdf
    • https://cdn.shopify.com/s/files/1/0444/4497/5271/files/el_alquimista_hp_lovecraft.pdf
    • https://cdn.shopify.com/s/files/1/0433/0445/2246/files/zopoditex.pdf
    • https://cdn.shopify.com/s/files/1/0433/2604/6362/files/variedades_del_cafe.pdf
    • https://cdn.shopify.com/s/files/1/0428/2174/6854/files/cambios_sociales_del_envejecimiento.pdf
    • https://cdn.shopify.com/s/files/1/0431/3343/6066/files/sapuzoxefotaresaw.pdf
    • https://cdn.shopify.com/s/files/1/0429/5095/1066/files/76971333175.pdf
    • https://cdn.shopify.com/s/files/1/0431/9975/8497/files/47987780828.pdf
    • https://cdn.shopify.com/s/files/1/0432/9691/5621/files/jumosalinuxufefe.pdf
    • https://cdn.shopify.com/s/files/1/0431/7295/4269/files/xigobori.pdf
    • https://cdn.shopify.com/s/files/1/0431/5666/8573/files/67748213466.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e19b.bin
16be4ba7eabf9f2500ffaaed74389dfa6a618cd68bd2035b5f19ddc399c0a72a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE19B 4944 bytes
font_01_sfnt_off0000f27e.bin
8f0c8cdeaad3685f4d6f79d0cbc27f6da6a633ff742d5b20889bd37b63e92022		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF27E 13284 bytes
font_02_sfnt_off00011bda.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11BDA 4324 bytes

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