Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f009a686527d051…

MALICIOUS

PDF

52.4 KB Created: 2020-08-05 05:44:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 15469d4439941351faf90fb9ae154386 SHA-1: dfb6be4b1eb13ff703530f634c551f37e4a779d8 SHA-256: 4f009a686527d051d99bb035d6667745ebf78c13d86a3c752fac68ffae37360b
152 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.ru, which is designed to lure users to malicious content. The document body, though heavily obfuscated, also contains this URL and numerous other links, many hosted on Shopify, suggesting a link farm or SEO poisoning tactic. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is used for 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/pify?keyword=brief+summary+of+the+bible+from+genesis+to+revelation+pdf
    • http://files.envirolawteachers.com/uploads/1/3/0/7/130775528/3ba7ca2.pdf
    • http://files.ontarioboardshack.com/uploads/1/3/0/8/130814636/vidatexonan.pdf
    • http://files.nextgenrugcleaning.com/uploads/1/3/2/8/132814476/9bc843afb90968.pdf
    • https://cdn.shopify.com/s/files/1/0437/8827/1777/files/pinellas_county_homestead_exemption.pdf
    • https://cdn.shopify.com/s/files/1/0440/1600/9374/files/nuxava.pdf
    • https://cdn.shopify.com/s/files/1/0432/5860/9819/files/52105538511.pdf
    • https://cdn.shopify.com/s/files/1/0435/5905/9615/files/kifewegisifitomukigijew.pdf
    • https://cdn.shopify.com/s/files/1/0432/5225/2829/files/rowofegowaro.pdf
    • https://cdn.shopify.com/s/files/1/0434/5489/0149/files/16034521499.pdf
    • https://cdn.shopify.com/s/files/1/0429/8565/2375/files/tekikukada.pdf
    • https://cdn.shopify.com/s/files/1/0431/4998/3901/files/wenod.pdf
    • https://cdn.shopify.com/s/files/1/0430/1655/2605/files/tivesemasek.pdf
    • https://cdn.shopify.com/s/files/1/0431/2491/6388/files/xazafubuxikozikebota.pdf
    • https://cdn.shopify.com/s/files/1/0434/1478/2103/files/jitexut.pdf
    • https://cdn.shopify.com/s/files/1/0434/5089/2454/files/buxikufasubexil.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_off00007e28.bin
70e6650ce9640a9d713b35aa214835aa2adcd05e4f0e85c5f4f22b4d909556b4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7E28 5688 bytes
font_01_sfnt_off00009161.bin
a0dd12473910617b9bae58cfbe8df58ac1b1680091fd97068169b121ad8dc93f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9161 10156 bytes
font_02_sfnt_off0000b412.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB412 4324 bytes

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