Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca6fadeaa3c489b2…

MALICIOUS

PDF

60.2 KB Created: 2020-08-29 07:23:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dc3e739f752e866123edec9eba4af078 SHA-1: 7edf2ee9ed372231920649953b14a35284080089 SHA-256: ca6fadeaa3c489b261e76f7f108bd6072256c55cfc8a3a1d3ab498a2b14598c2
152 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with a critical heuristic firing for a malicious redirector link pointing to 'ttraff.ru'. Another critical heuristic identified a PDF link farm, with the first URL leading to a Shopify domain. The ML classifier strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains the same redirector URL and a list of Shopify URLs, suggesting a coordinated effort to direct users to malicious infrastructure.

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=divinity+2+original+sin+fort+joy
    • https://cdn.shopify.com/s/files/1/0435/4398/6335/files/2606316399.pdf
    • https://cdn.shopify.com/s/files/1/0429/3866/3079/files/83663423454.pdf
    • https://cdn.shopify.com/s/files/1/0429/1588/9305/files/sulifami.pdf
    • https://cdn.shopify.com/s/files/1/0433/1261/1481/files/vuzudedosuko.pdf
    • https://cdn.shopify.com/s/files/1/0429/8830/6586/files/ace_engineering_academy_books.pdf
    • https://cdn.shopify.com/s/files/1/0431/3110/9540/files/rugizevugesizume.pdf
    • https://cdn.shopify.com/s/files/1/0463/2533/4171/files/calvin_klein_shirts_size_guide.pdf
    • https://cdn.shopify.com/s/files/1/0432/4655/1208/files/fewenabeludenos.pdf
    • https://cdn.shopify.com/s/files/1/0430/2051/7537/files/xaxamokurukodoguzofone.pdf
    • https://cdn.shopify.com/s/files/1/0433/7503/4520/files/besobijaneguxebu.pdf
    • https://cdn.shopify.com/s/files/1/0431/5129/4619/files/define_brand_equity.pdf
    • https://cdn.shopify.com/s/files/1/0433/8361/9736/files/47431486002.pdf
    • https://cdn.shopify.com/s/files/1/0428/0962/2687/files/sickle_cell_disease_complications.pdf
    • https://cdn.shopify.com/s/files/1/0432/7643/5621/files/99021646547.pdf
    • https://cdn.shopify.com/s/files/1/0440/1247/0422/files/teboradisepusejed.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_off0000a19e.bin
f32e71bdb5f7fe93b39d5b7204557a11d09fa7bd44bb01aabb6d3fb35077b291		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA19E 4972 bytes
font_01_sfnt_off0000b29f.bin
48f628eeb430a624db6cc72b155601fbba841aa3baef92bf1b0f83c573bb8c3c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB29F 10300 bytes
font_02_sfnt_off0000d5c0.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD5C0 4324 bytes

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