Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbfcd85afbabe981…

MALICIOUS

PDF

31.8 KB Created: 2020-08-25 04:12:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f1f1249cf42c9520f39e6b92c1c7a14c SHA-1: 39ab2bd84bdb0601f6f8f7db487b891783fed451 SHA-256: cbfcd85afbabe98139e46d56ba7025ce82330721c8c2edd720759d4196e86211
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged as malicious by an ML classifier and contains a large number of external links. One of these links points to a known malicious redirector, ttraff.ru, which is likely used to obscure the final destination of the malicious content. The document body contains text related to 'Slayer full album' and the authoring application, suggesting a lure to attract clicks on the embedded links.

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=slayer+full+album
    • http://files.ctdaus.com/uploads/1/3/0/7/130776407/bededi.pdf
    • https://cdn.shopify.com/s/files/1/0429/7257/7946/files/pillars_of_eternity_ranged_cipher_build.pdf
    • https://cdn.shopify.com/s/files/1/0428/5965/9420/files/biblia_ortodoxa_download.pdf
    • https://cdn.shopify.com/s/files/1/0434/6953/7432/files/favavazijijigibe.pdf
    • https://cdn.shopify.com/s/files/1/0437/1709/9685/files/aprendizaje_significativo_teora_y_prctica.pdf
    • https://cdn.shopify.com/s/files/1/0438/1271/6704/files/34515136738.pdf
    • https://cdn.shopify.com/s/files/1/0438/3647/3501/files/fejijimubufe.pdf
    • https://cdn.shopify.com/s/files/1/0430/5318/7223/files/56307551012.pdf
    • https://cdn.shopify.com/s/files/1/0433/6130/4728/files/79380772869.pdf
    • https://cdn.shopify.com/s/files/1/0432/6552/3862/files/92518121681.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004053.bin
174df1909562218b3a3d47dd77dbbccdabb2a6596bd97a8278fc51621fe33179		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4053 5080 bytes
font_01_sfnt_off00005186.bin
727b75d26f19e6df6bc5226a3cc34181477125c0920c36f460359d4f26f85ded		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5186 10136 bytes

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