Malicious PDF — malware analysis report

Static analysis result for SHA-256 6838ac9482b7f5f8…

MALICIOUS

PDF

75.2 KB Created: 2020-08-08 23:58:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 76445db256dbe018f8c53e342dc9234b SHA-1: 21784979be3afbb52ca959e3569993bf6e2b9070 SHA-256: 6838ac9482b7f5f8b40485d9301a28e50fbd8f3e385f9cc0107b111f42978779
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains numerous links, many pointing to what appears to be a link farm designed to host malicious content, with one critical link identified as a redirector to 'ttraff.com'. The document body, though heavily obfuscated, contains text related to accounting and a URL that matches the redirector heuristic, suggesting a lure for financial scams or credential harvesting. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise 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=accounting+journal+entry+practice+test+pdf
    • http://files.yaginoodles.com/uploads/1/3/1/0/131070539/8994577.pdf
    • http://files.martigraceashby.com/uploads/1/3/0/8/130874610/nejulomimur.pdf
    • http://files.bridgewatercare.org.uk/uploads/1/3/1/4/131407552/95b9cff.pdf
    • http://lopugux.inspiredayurveda.com/uploads/1/3/1/6/131606407/6802873.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/8616/7702/files/berujoxofeseva.pdf
    • https://cdn.shopify.com/s/files/1/0434/0583/6438/files/40367217858.pdf
    • https://cdn.shopify.com/s/files/1/0430/3680/3233/files/54410647445.pdf
    • https://cdn.shopify.com/s/files/1/0430/5112/2842/files/42211651945.pdf
    • https://cdn.shopify.com/s/files/1/0440/8950/7990/files/architectural_perspective_drawing_tutorial.pdf
    • https://cdn.shopify.com/s/files/1/0427/3415/7991/files/subatepukaj.pdf
    • https://cdn.shopify.com/s/files/1/0432/0958/8897/files/mukifufix.pdf
    • https://cdn.shopify.com/s/files/1/0433/9495/7470/files/selogowaxefexawasinarojul.pdf
    • https://cdn.shopify.com/s/files/1/0438/7074/8827/files/45303913324.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/pidepuwavulosetanujerepub.pdf
    • https://cdn.shopify.com/s/files/1/0433/1172/6750/files/setupejumozoz.pdf
    • https://cdn.shopify.com/s/files/1/0431/3071/6326/files/19288308616.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e75a.bin
a6925b3a8fbd7e76168075242ca6369ddd969ddde097a1eed99dc8356decc857		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE75A 5488 bytes
font_01_sfnt_off0000fa26.bin
b90a3f0bedbef480cffc3e9f80483a4d692396a402b24d83e28b51b61ab78e0c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA26 11032 bytes

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