Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd02aac7d4bf0387…

MALICIOUS

PDF

58.5 KB Created: 2020-08-12 23:58:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d503f17d7b9915d4483e5ed9307daff5 SHA-1: 19e7f2c244f968b7a2eb24e587873dc09b4068d0 SHA-256: dd02aac7d4bf0387e51a6e154848241863be8a764e469df2616c06a127d64c4c
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF file was flagged as malicious by an ML classifier and contains numerous embedded links. One critical heuristic indicates the PDF links to known malicious redirector infrastructure, specifically 'ttraff.ru'. Another heuristic identifies it as a PDF link farm, with many links pointing to Shopify domains, though one is confirmed benign. The document body, though heavily obfuscated, contains the URL 'https://ttraff.ru/wb?keyword=spanish%20worksheet%20ks2' and a Shopify URL, suggesting a lure related to educational materials to mask the malicious redirection.

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=spanish%20worksheet%20ks2
    • http://files.tommysguitars.com/uploads/1/3/2/6/132695213/8cc78c.pdf
    • http://files.tuckerdevotions.com/uploads/1/3/0/9/130969446/jowibelemumovit_mavisu_sinaxal.pdf
    • http://files.kayecameron.com/uploads/1/3/2/6/132681969/19a9ef427d85.pdf
    • http://nogizitan.lovebabiestennis.com/uploads/1/3/1/6/131606289/8183672.pdf
    • http://jemulox.seekadventuremedia.com/uploads/1/3/1/3/131381679/5554410.pdf
    • https://cdn.shopify.com/s/files/1/0431/7229/8913/files/nivaxitimovanateximuwirek.pdf
    • https://cdn.shopify.com/s/files/1/0431/0306/0128/files/construction_company_profile_south_africa.pdf
    • https://cdn.shopify.com/s/files/1/0434/6318/0438/files/72133049932.pdf
    • https://cdn.shopify.com/s/files/1/0432/6513/0658/files/zezuri.pdf
    • https://cdn.shopify.com/s/files/1/0428/1955/1388/files/89092273775.pdf
    • https://cdn.shopify.com/s/files/1/0439/0112/4760/files/rowovutujaropuzabunirut.pdf
    • https://cdn.shopify.com/s/files/1/0431/9005/9176/files/xilubufazalufuvini.pdf
    • https://cdn.shopify.com/s/files/1/0433/3908/8027/files/arutunian_trumpet_concerto_piano.pdf
    • https://cdn.shopify.com/s/files/1/0431/5598/0450/files/benejebuno.pdf
    • https://cdn.shopify.com/s/files/1/0428/0988/4838/files/28390511351.pdf
    • https://cdn.shopify.com/s/files/1/0433/8306/2695/files/types_of_public_relations_research.pdf
    • https://cdn.shopify.com/s/files/1/0432/1899/3307/files/bamuletuz.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00009307.bin
09e06dc41e5b314b0e36f54ae729617559c1e0fb5e4199c399f328fd73c17839		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9307 5056 bytes
font_01_sfnt_off0000a42c.bin
ca5b2543c0e8ed842000a2273449237beda05ff2aadc4550e2922520a916d3b4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA42C 13736 bytes
font_02_sfnt_off0000ce91.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCE91 4324 bytes

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