Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b75a3f64b198ca7…

MALICIOUS

PDF

46.6 KB Created: 2020-08-10 16:32:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e6b038649076413ff27d5497810159d7 SHA-1: e6d202246d03ee601b36c176b493ebb70b0cbc1f SHA-256: 9b75a3f64b198ca7450147cbf4ec87673158238653eb68dce6d258a4611a3737
154 Risk Score

Malware Insights

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

The PDF was flagged as malicious by a critical heuristic due to a link to a known malicious redirector. Additionally, it contains a large number of embedded links, many pointing to Shopify domains, suggesting a link farm or redirection strategy. The ML classifier also strongly indicated maliciousness. The document body contains obfuscated text and a URL that appears to be part of the redirection chain.

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.com/pify?keyword=seno+carotideo+pdf
    • http://files.londonrecordingstudioexperience.com/uploads/1/3/1/4/131453432/4403929.pdf
    • http://files.match-gems.com/uploads/1/3/0/9/130969243/waruxe-gibotusupuwe-viputefetapaj-walugogigebomev.pdf
    • http://files.homeherbals.com/uploads/1/3/1/3/131380871/vatit_bapekikugaxu_bizes_vuwuj.pdf
    • http://delik.carpetcleaning352.com/uploads/1/3/2/6/132682989/ropefemeretesov.pdf
    • http://files.girlknewyork.com/uploads/1/3/1/3/131384432/vimalizolowin-lowajuxavopit-fabujuloju.pdf
    • https://cdn.shopify.com/s/files/1/0438/8339/7275/files/zokaduwiguvekiti.pdf
    • https://cdn.shopify.com/s/files/1/0439/6023/8238/files/2819896830.pdf
    • https://cdn.shopify.com/s/files/1/0433/3964/5093/files/wenefawud.pdf
    • https://cdn.shopify.com/s/files/1/0434/0989/9670/files/kidewetixilikenoxakebale.pdf
    • https://cdn.shopify.com/s/files/1/0430/8484/1124/files/68439402049.pdf
    • https://cdn.shopify.com/s/files/1/0430/9218/1153/files/ravoginudususuzokenexu.pdf
    • https://cdn.shopify.com/s/files/1/0434/0459/1271/files/kubulubekegiminol.pdf
    • https://cdn.shopify.com/s/files/1/0433/8450/4474/files/pathology_made_ridiculously_simple_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0430/8742/9781/files/mcdonalds_uk_menu.pdf
    • https://cdn.shopify.com/s/files/1/0431/2816/0420/files/cae_speaking_exam.pdf
    • https://cdn.shopify.com/s/files/1/0434/1248/8343/files/beyond_training.pdf
    • https://cdn.shopify.com/s/files/1/0428/8797/0975/files/cosmic_irony_definition.pdf
    • https://cdn.shopify.com/s/files/1/0429/2696/4895/files/60610550514.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_off000078b8.bin
3017537aa2933450fbf6bc55c2098261d982bd07fde158f07bf30943c2595834		 pdf-font-stream PDF embedded font (sfnt) at offset 0x78B8 5044 bytes
font_01_sfnt_off000089e5.bin
830872cba7e731bc4f795b2bffac44695493131a13e905d01cee6ad5182a536e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x89E5 10376 bytes

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