Malicious PDF — malware analysis report

Static analysis result for SHA-256 04ed79cf96783c78…

MALICIOUS

PDF

53.0 KB Created: 2020-08-28 22:31:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 77ae1b2f2a9216318f382e81318cea1d SHA-1: ebc14f3df8ce2701e65a8c52321550f52c691eab SHA-256: 04ed79cf96783c78eaf87c613dc340e900b8f4b474308be581492d89e9532856
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure, specifically `https://ttraff.ru/wix?keyword=swiss+army+man+script`. Additionally, it exhibits characteristics of a PDF SEO link farm, embedding numerous links to external PDFs, many hosted on Shopify. The document body, though heavily obfuscated, contains the same redirector URL, suggesting an attempt to disguise its malicious nature. The presence of embedded URLs and the ML classifier's high confidence further support the malicious classification.

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=swiss+army+man+script
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/99913566500.pdf
    • https://cdn.shopify.com/s/files/1/0435/1157/8776/files/buliwowifagafa.pdf
    • https://cdn.shopify.com/s/files/1/0434/6036/2392/files/pobamuwoviroje.pdf
    • https://cdn.shopify.com/s/files/1/0435/9149/9935/files/belly_exercise_video.pdf
    • https://cdn.shopify.com/s/files/1/0440/2275/9582/files/21577087669.pdf
    • https://cdn.shopify.com/s/files/1/0431/6371/3690/files/folder_cancer_de_boca.pdf
    • https://cdn.shopify.com/s/files/1/0435/7668/8798/files/best_barbarian_build_diablo_3.pdf
    • https://cdn.shopify.com/s/files/1/0431/7682/0890/files/duruporem.pdf
    • https://cdn.shopify.com/s/files/1/0432/7918/8118/files/68908004418.pdf
    • https://cdn.shopify.com/s/files/1/0433/7546/0515/files/bollywood_actress_photos.pdf
    • https://cdn.shopify.com/s/files/1/0428/2250/0518/files/nodadowezofu.pdf
    • https://cdn.shopify.com/s/files/1/0439/2691/3179/files/definition_of_marketing_concept.pdf
    • https://cdn.shopify.com/s/files/1/0428/5664/4774/files/rugemewubukojepozado.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_off00008535.bin
693318e8b5556c08ab98740586d23ef1709ab2ef68217128e72094ed8c909cd9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8535 4904 bytes
font_01_sfnt_off000095c2.bin
993087641c93c15dbe1897e6c78894f129e98c7db98fc5dc637d64e77be957fb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x95C2 10316 bytes
font_02_sfnt_off0000b8cf.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB8CF 4324 bytes

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