Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6ab8133c4047866…

MALICIOUS

PDF

38.7 KB Created: 2020-08-16 21:23:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a16a4cc0c3da2f050ed8ad23910f53d0 SHA-1: ed35486cf4691e0e365cf92617a209e122078ef2 SHA-256: c6ab8133c40478663919154c7f637a3588d7a78db230d8f58990f2fe0e94044b
150 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'ttraff.com'. This URL is presented in the document body, disguised as a search result for 'Billie eilish bellyache piano sheet music', indicating a lure to trick users into clicking. The PDF also exhibits characteristics of a link farm, with numerous embedded URLs, many of which point to Shopify domains but some to unknown or potentially malicious domains. The ML classifier strongly supports the malicious verdict.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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.com/pify?keyword=billie+eilish+bellyache+piano+sheet+music
    • http://naniki.waods.net/uploads/1/3/1/4/131407089/fezisabowisuj.pdf
    • http://semurivu.nancynjuguna.com/uploads/1/3/1/1/131164250/4df83099c709.pdf
    • http://files.togetherforthelongrun.org/uploads/1/3/0/7/130775888/669d8467b1.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/84511803825.pdf
    • https://cdn.shopify.com/s/files/1/0431/9641/6157/files/sasulugatotaxamubok.pdf
    • https://cdn.shopify.com/s/files/1/0430/1658/5379/files/rususu.pdf
    • https://cdn.shopify.com/s/files/1/0433/4298/7423/files/differentiability_questions_and_answers.pdf
    • https://cdn.shopify.com/s/files/1/0431/0971/2021/files/22963831399.pdf
    • https://cdn.shopify.com/s/files/1/0439/0476/2011/files/29279029806.pdf
    • https://cdn.shopify.com/s/files/1/0432/2823/3883/files/singer_sewing_machine_manual.pdf
    • https://cdn.shopify.com/s/files/1/0434/4568/2332/files/punem.pdf
    • https://cdn.shopify.com/s/files/1/0428/6958/8124/files/tom_hiddleston_net_worth.pdf
    • https://cdn.shopify.com/s/files/1/0434/4178/2950/files/xewaxof.pdf
    • https://cdn.shopify.com/s/files/1/0433/8103/1075/files/28187239940.pdf
    • https://cdn.shopify.com/s/files/1/0427/3229/0215/files/xulasarefexi.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_off00004d6c.bin
6a3fbefab817ca21e60b8020a7c4de24b539293d346a36e35eb136847b8684df		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4D6C 5368 bytes
font_01_sfnt_off00005f80.bin
2cdf5e4ea420f8897424178f9c4ab46e9160378fbffd6e050ef59ed9433ceeab		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F80 14780 bytes

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