Malicious PDF — malware analysis report

Static analysis result for SHA-256 7433d458645020a2…

MALICIOUS

PDF

42.0 KB Created: 2020-08-30 12:09:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8264c4f4f7129218f43cc289829932bd SHA-1: 4cfadecd34c5c99d4d80e477256d77a1749098e9 SHA-256: 7433d458645020a2d90a8343ee98ecf3448cb4139afe795c0262fde8c477a4d0
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'ttraff.ru'. It also exhibits a PDF link farm heuristic, with numerous links to Shopify-hosted PDFs. The ML classifier strongly flagged this PDF as malicious. While no scripts were extracted, the presence of embedded links and the nature of the heuristics suggest an attempt to redirect users to malicious infrastructure, likely as part of a phishing or SEO-based attack.

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=back+mechanic+stuart+mcgill+pdf+reddit
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/1135/8372/files/fanaduji.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/fofigez.pdf
    • https://cdn.shopify.com/s/files/1/0437/2129/3974/files/autocad_2014_manual_free.pdf
    • https://cdn.shopify.com/s/files/1/0427/5650/5756/files/boriveturaso.pdf
    • https://cdn.shopify.com/s/files/1/0435/9513/7181/files/sony_kdl40r510c_manual.pdf
    • https://cdn.shopify.com/s/files/1/0462/6618/7930/files/1652667514.pdf
    • https://cdn.shopify.com/s/files/1/0454/5645/7880/files/audacity_free_for_windows_7.pdf
    • https://cdn.shopify.com/s/files/1/0434/5217/0406/files/beta_house_movie_300mb.pdf
    • https://cdn.shopify.com/s/files/1/0436/9488/2984/files/zotominelerota.pdf
    • https://cdn.shopify.com/s/files/1/0438/9063/9000/files/cancellation_of_contract_form_real_estate.pdf
    • https://cdn.shopify.com/s/files/1/0431/1141/5962/files/67170051353.pdf
    • https://cdn.shopify.com/s/files/1/0433/4977/0389/files/analog_to_digital_converter_block_diagram.pdf
    • https://cdn.shopify.com/s/files/1/0433/8194/8567/files/niwazisurabevogobop.pdf
    • https://cdn.shopify.com/s/files/1/0436/4160/2208/files/97989733150.pdf
    • https://cdn.shopify.com/s/files/1/0432/7201/1931/files/21195382628.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_off00006489.bin
e77969a92f94bff6251b7377d253072b6eb894a8c81f7af1c6caf485318c1d9e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6489 5684 bytes
font_01_sfnt_off000077ba.bin
60481d92a63b5f05b352f95ebcfe1126f7b2c193a730c9fe480a2fa49105dc6b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x77BA 10316 bytes

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