Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab4dd6b5c9f77749…

MALICIOUS

PDF

39.0 KB Created: 2020-08-13 22:23:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d9e089b61da0166ab4970ff8b85980e5 SHA-1: 2e756adfa6afa050d03815eed6c271ec53982a99 SHA-256: ab4dd6b5c9f777493032b4a3a0473a19767dce8f77281e7d47a6aa7c09055f96
152 Risk Score

Malware Insights

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

The PDF file was flagged by multiple critical heuristics indicating malicious redirector links and a link farm. The ML classifier also strongly indicated maliciousness. The embedded URLs, particularly the one pointing to 'ttraff.ru', are likely part of a phishing or malware distribution scheme. The presence of numerous links, many hosted on 'cdn.shopify.com' and other domains, suggests an attempt to create a broad attack surface or obscure the final malicious destination.

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=kutty+songs++tamil+film
    • http://kovarefo.adastraspeech.com/uploads/1/3/1/4/131438464/rizikew_didoxezaso_xizikix_luregot.pdf
    • http://dimex.jerryyounce.com/uploads/1/3/1/3/131379730/6355986.pdf
    • http://files.unitedtrainingtrust.com/uploads/1/3/1/3/131383283/03ce1f24731b2cb.pdf
    • http://files.patwinslow.com/uploads/1/3/0/7/130738620/kelinalituge_xelaxutotav_xedodepati_pures.pdf
    • https://cdn.shopify.com/s/files/1/0429/5449/0022/files/76364522016.pdf
    • https://cdn.shopify.com/s/files/1/0428/2331/9715/files/xaduwole.pdf
    • https://cdn.shopify.com/s/files/1/0430/7035/7661/files/musica_aleatoria.pdf
    • https://cdn.shopify.com/s/files/1/0432/3213/3278/files/fivozemalatiwa.pdf
    • https://cdn.shopify.com/s/files/1/0439/9644/6878/files/candlestick_patterns_explained.pdf
    • https://cdn.shopify.com/s/files/1/0445/8492/7396/files/mapa_turistico_aguilar_de_campoo.pdf
    • https://cdn.shopify.com/s/files/1/0431/6826/8456/files/anatomy_knee_joint.pdf
    • https://cdn.shopify.com/s/files/1/0432/2885/6477/files/dotufogoson.pdf
    • https://cdn.shopify.com/s/files/1/0437/8044/0213/files/teste_de_antiglobulina_humana.pdf
    • https://cdn.shopify.com/s/files/1/0430/4489/6925/files/rifezesebojagilowubigevow.pdf
    • https://cdn.shopify.com/s/files/1/0430/7720/6165/files/forever_the_new_tattoo.pdf
    • https://cdn.shopify.com/s/files/1/0434/7058/6022/files/velivozagupixur.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_off00005c64.bin
130d8828299f6ec4c1eb7f7be8cd07b151d49c06731edf6a00e7b972889d9c85		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5C64 5060 bytes
font_01_sfnt_off00006d9e.bin
44d5c645a15095559593f6e670b123455334dd5472afa757087cc17ba6235607		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D9E 9816 bytes

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