Malicious PDF — malware analysis report

Static analysis result for SHA-256 9752143577ca474f…

MALICIOUS

PDF

37.5 KB Created: 2020-09-02 00:28:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0412d0ee80d7f25c5f1b33f37f9a5c48 SHA-1: 0e830b5868d5ac4cf1c38070cb3937a0e5294635 SHA-256: 9752143577ca474f735fc1a740890a8869694bf0f931602e9150a7c7eb732c29
150 Risk Score

Malware Insights

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

The PDF was flagged by multiple critical heuristics for containing a malicious redirector link and a large number of external PDF links, suggesting a link farm or SEO poisoning attempt. The embedded URL points to a redirector service, which is a common technique for obscuring the final malicious destination. The document body contains garbled text but also includes the suspicious URL and several Shopify-hosted PDF links, reinforcing the link farm heuristic.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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.link/pify?keyword=crossword+answer+without+doubt
    • https://cdn.shopify.com/s/files/1/0439/0027/2792/files/sumejopo.pdf
    • https://cdn.shopify.com/s/files/1/0437/3653/1095/files/multiplex_pcr_procedure.pdf
    • https://cdn.shopify.com/s/files/1/0435/0604/0992/files/51038654907.pdf
    • https://cdn.shopify.com/s/files/1/0434/5239/9777/files/taking_cara_babies_abcs_of_sleep_download.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/92399027362.pdf
    • https://cdn.shopify.com/s/files/1/0427/4041/6678/files/area_and_perimeter_of_rectangles_and_triangles_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0433/4606/7605/files/21072893751.pdf
    • https://static.usrfiles.com/ugd/96768c_d0cdfda880dd4adf96029a6fda893623.pdf
    • https://static.usrfiles.com/ugd/6846fe_7e5065e9716c4fb1a42810020339fdce.pdf
    • https://static.usrfiles.com/ugd/f34823_fa2aaa0ea5804e76b4f66a412e1c1463.pdf
    • https://static.usrfiles.com/ugd/599026_547f21b8c5d5494c97e5a882d438b80e.pdf
    • https://cdn.shopify.com/s/files/1/0428/4419/2935/files/jeteditarigad.pdf
    • https://cdn.shopify.com/s/files/1/0447/7501/4566/files/11137315349.pdf
    • https://cdn.shopify.com/s/files/1/0429/9754/7157/files/wojekuditowikidewez.pdf
    • https://cdn.shopify.com/s/files/1/0437/8948/4190/files/aha_guideline_2018_cholesterol.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_off00004d14.bin
50e3753fcfe5b140a739d78b7df1bd24a46e70bbbc94c71d44c8a326dd983581		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4D14 5020 bytes
font_01_sfnt_off00005e28.bin
678bf3dffa08525e2325347132059d9563d2d296b66e4176ee5b67aa0346de19		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E28 13388 bytes

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