Malicious PDF — malware analysis report

Static analysis result for SHA-256 f599cbd2d3012e04…

MALICIOUS

PDF

47.5 KB Created: 2020-08-30 15:19:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 16ada3b7655ba1ac4f4914f6a0927f03 SHA-1: e7337876eb97d72b7402e2b026df170cc567ab0a SHA-256: f599cbd2d3012e040db3c626e55b55ddd89952583392969c8f3c20f1ccbbacb6
152 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. Additionally, it exhibits characteristics of a PDF link farm, embedding numerous external PDF links, many hosted on cdn.shopify.com. The ML classifier strongly flagged this PDF as malicious. The embedded URL in the document body, 'https://ttraff.com/wix?keyword=calidad+del+aprendizaje+universitario+biggs+pdf', is the primary indicator of malicious intent, likely serving as a lure to a phishing or malware distribution site.

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/wix?keyword=calidad+del+aprendizaje+universitario+biggs+pdf
    • https://cdn.shopify.com/s/files/1/0439/1872/1192/files/gorifaxaro.pdf
    • https://cdn.shopify.com/s/files/1/0434/0973/5845/files/sirede.pdf
    • https://cdn.shopify.com/s/files/1/0431/2917/6232/files/42667059165.pdf
    • https://cdn.shopify.com/s/files/1/0427/4513/5260/files/96759979546.pdf
    • https://cdn.shopify.com/s/files/1/0436/0116/6498/files/dinezetuxuxubi.pdf
    • https://cdn.shopify.com/s/files/1/0432/0477/1999/files/47797699724.pdf
    • https://cdn.shopify.com/s/files/1/0432/9144/3364/files/lagrange_ga_weather_report.pdf
    • https://cdn.shopify.com/s/files/1/0434/3549/1490/files/69279704583.pdf
    • https://static.usrfiles.com/ugd/ecec20_24eb5ae7ba364413a09240bec6cc9850.pdf
    • https://static.usrfiles.com/ugd/b8c837_207b4d899bf84769bf205cc39dfc9b4f.pdf
    • https://static.usrfiles.com/ugd/b8c837_f97fa90c669740a3bcc3e42ca525cfbf.pdf
    • https://static.usrfiles.com/ugd/b8c837_219904eb461341b78c0d4031c6bdbdb9.pdf
    • https://static.usrfiles.com/ugd/d902bb_e2e6c36c788144699b2cb12938e97fc1.pdf
    • https://cdn.shopify.com/s/files/1/0435/9408/8616/files/yahoo_tv_listings.pdf
    • https://cdn.shopify.com/s/files/1/0435/4283/9455/files/international_t444e_service_manual.pdf
    • https://cdn.shopify.com/s/files/1/0430/9444/2133/files/netujumebalazisedurogipa.pdf
    • https://cdn.shopify.com/s/files/1/0437/7162/5621/files/caprice_24_sheet_music.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000590e.bin
874815395463af911c889bdfb6fe5cea89709cbfdd0ff91cd3ffadd7b7ffa836		 pdf-font-stream PDF embedded font (sfnt) at offset 0x590E 5440 bytes
font_01_sfnt_off00006ba6.bin
c8c0532c16f2e59408f5d7a18d49148e4e5aa9eced2a895b4760d50162f4134e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6BA6 11272 bytes
font_02_sfnt_off00009090.bin
b5bca56f41991f4b8d89ffb755b57b427cb716b940a8399b9ca9673b8aad6528		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9090 18720 bytes

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