Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d5b1cee068897e2…

MALICIOUS

PDF

45.6 KB Created: 2020-08-11 21:46:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1e0df74f7bd8a2eb9660d217220a5844 SHA-1: c567ad8d20d72f1bb65ea7ed9fd07ede96f79f2c SHA-256: 2d5b1cee068897e260bc654a758a9fe9f35c002f65a299f420decda5c3bfcfd7
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.cc/pify?keyword=aisi+4140+material+properties+pdf'. This indicates the document's primary purpose is to redirect users to a malicious site. The document body also contains this URL and numerous other links, many hosted on Shopify, suggesting a link farm or SEO poisoning tactic to distribute malicious content. The ML classifier strongly supports the malicious nature of this PDF.

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.cc/pify?keyword=aisi+4140+material+properties+pdf
    • http://tivoseto.apexmedicalgas.com/uploads/1/3/1/1/131164250/fikepika-tigifenugab-luzaroku.pdf
    • http://fademe.salemfurniturerepair.com/uploads/1/3/1/4/131437919/mipigenabetawa-zofewe.pdf
    • http://files.greatartworkshops.com/uploads/1/3/1/8/131856173/pijokemovu-negivotizuvido-duwanaduzu-bazagusel.pdf
    • http://files.londonhalleditions.com/uploads/1/3/1/1/131163872/nalod.pdf
    • http://defeposab.perthkitchendoorreplacement.com.au/uploads/1/3/0/7/130775436/xedonani.pdf
    • https://cdn.shopify.com/s/files/1/0433/8676/5475/files/90068850855.pdf
    • https://cdn.shopify.com/s/files/1/0430/3316/5986/files/kafemidunogeniwido.pdf
    • https://cdn.shopify.com/s/files/1/0431/9304/1053/files/23047937370.pdf
    • https://cdn.shopify.com/s/files/1/0437/5930/4858/files/nfpt_study_guide.pdf
    • https://cdn.shopify.com/s/files/1/0430/2602/2557/files/bawajesuw.pdf
    • https://cdn.shopify.com/s/files/1/0436/9013/1609/files/zaxofe.pdf
    • https://cdn.shopify.com/s/files/1/0434/4047/2229/files/zumijigipex.pdf
    • https://cdn.shopify.com/s/files/1/0440/1207/7206/files/jazixalajidaj.pdf
    • https://cdn.shopify.com/s/files/1/0433/2358/8773/files/befefe.pdf
    • https://cdn.shopify.com/s/files/1/0430/2353/2195/files/15182975671.pdf
    • https://cdn.shopify.com/s/files/1/0438/3395/0358/files/barca_innovation_hub.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_off00006bfc.bin
16bef76110fa220897f9b6b9de82e2b968f37006579896e5cca871baef354e67		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6BFC 5456 bytes
font_01_sfnt_off00007e75.bin
7820994005d1e25a773268586031883a4bf2e2a6807d47fb30c80e2dec6fffcc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7E75 13652 bytes

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