Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b2d2ef996c15486…

MALICIOUS

PDF

41.3 KB Created: 2020-08-12 15:52:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 662cc30cb4a07f2d1719bc565de9f5cf SHA-1: 305b1dff1bccd49f32d2acab97030e92fc9ee168 SHA-256: 5b2d2ef996c154865adb472ab9ab8bbc46a6af9df852b8aba33e958793853a3e
154 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to a link farm hosted on Shopify, but one prominent URL, 'https://ttraff.ru/wb?keyword=stages%20of%20parturition%20in%20cattle%20pdf', is identified as a malicious redirector. This suggests the document is designed to lead users to malicious infrastructure, likely for further exploitation or phishing. 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/wb?keyword=stages%20of%20parturition%20in%20cattle%20pdf
    • http://files.performanceptky.com/uploads/1/3/2/3/132303045/c92a2efb1fdb.pdf
    • http://files.semperfryllc.com/uploads/1/3/2/6/132681826/wabawibe_zejulutizipula.pdf
    • http://files.touchingtheart.com/uploads/1/3/2/6/132680796/755145.pdf
    • http://suzaruw.deltacouncil.org/uploads/1/3/0/9/130969465/e9f2b0830b060.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/7103/6822/files/60000530925.pdf
    • https://cdn.shopify.com/s/files/1/0429/2087/0044/files/exemple_d_avant_propos_d_un_rapport_de_stage.pdf
    • https://cdn.shopify.com/s/files/1/0432/8056/4392/files/holy_bible_kjv_download.pdf
    • https://cdn.shopify.com/s/files/1/0440/9622/5432/files/kevufomizuwejezupi.pdf
    • https://cdn.shopify.com/s/files/1/0434/0737/6546/files/national_oil_seal_cross_reference.pdf
    • https://cdn.shopify.com/s/files/1/0431/4441/3341/files/24590829650.pdf
    • https://cdn.shopify.com/s/files/1/0431/4267/6648/files/39284394211.pdf
    • https://cdn.shopify.com/s/files/1/0437/7922/7810/files/49070323026.pdf
    • https://cdn.shopify.com/s/files/1/0433/9243/4326/files/16288221902.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/31321710084.pdf
    • https://cdn.shopify.com/s/files/1/0450/8103/4917/files/aop_in._net_practical_aspect_oriented_programming.pdf
    • https://cdn.shopify.com/s/files/1/0447/0685/7113/files/silebululaseli.pdf
    • https://cdn.shopify.com/s/files/1/0437/5805/9674/files/riesgo_pais_definicion.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_off000062f9.bin
6bbfadf62dc0a2f02c99b58648403397e0dc5b90cc065af0d850ee589b6de349		 pdf-font-stream PDF embedded font (sfnt) at offset 0x62F9 5424 bytes
font_01_sfnt_off00007576.bin
bf25103d47e34e30c1da82829ed259045beec72d904409ece4295db04380d87f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7576 10236 bytes

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