Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0dc0f97ed8ab65f…

MALICIOUS

PDF

35.1 KB Created: 2020-08-29 13:37:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: af5dbc60d50a34ff7f951276b055d0be SHA-1: 7204b42f5db49b5c82d47285e0727e4de74920e2 SHA-256: d0dc0f97ed8ab65f35b1b4ba06df9ac6d86af025961543d7c8765ab27c185678
150 Risk Score

Malware Insights

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

The PDF contains a high number of embedded links, many of which point to a link farm hosted on Shopify. One critical heuristic identified a malicious redirector link, which is the primary IOC. The document body, though heavily obfuscated, contains the URL that likely serves as the lure. The ML classifier strongly indicates maliciousness.

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.cc/wix?keyword=2020+bmw+8+series
    • https://cdn.shopify.com/s/files/1/0431/7977/0019/files/what_is_the_difference_between_r_and.pdf
    • https://cdn.shopify.com/s/files/1/0462/6884/2146/files/26458325009.pdf
    • https://cdn.shopify.com/s/files/1/0432/8721/6293/files/bisawetaxemoditoxigakotob.pdf
    • https://cdn.shopify.com/s/files/1/0438/0708/0605/files/kopixis.pdf
    • https://static.usrfiles.com/ugd/b8c837_577d03c2bc6a44589703ca04f8528cd5.pdf
    • https://static.usrfiles.com/ugd/b8c837_3f1fb5a9ce374db392d8b867ee4b25a7.pdf
    • https://static.usrfiles.com/ugd/b8c837_c5e2d96e8b664eca90f671195c5a7cb4.pdf
    • https://static.usrfiles.com/ugd/b8c837_b8813a76683e41758b0793fc6c1a0021.pdf
    • https://static.usrfiles.com/ugd/b8c837_2b933f5f6e99408eb214fd4efcbba7dc.pdf
    • https://static.usrfiles.com/ugd/b8c837_1a29f9951aea4dab93983de1681721be.pdf
    • https://static.usrfiles.com/ugd/b8c837_012c1a48c59c4d30b027a1d7a6c9ffdf.pdf
    • https://static.usrfiles.com/ugd/b8c837_f2b9c0691c9c469990171cac812cc43f.pdf
    • https://static.usrfiles.com/ugd/b8c837_d8e06fc5fe7142e8833420b4b276a4ec.pdf
    • https://cdn.shopify.com/s/files/1/0429/7257/7946/files/the_astral_body.pdf
    • https://cdn.shopify.com/s/files/1/0431/0820/4701/files/70981787136.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_off00004d49.bin
a751fdd1e3d3743987e06c2b3319b7767918e281882e17a883f9fa14e1000181		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4D49 5192 bytes
font_01_sfnt_off00005eec.bin
d584516d8c6a65d19681930b0eff59394cee7063743e316e2b8df6a56d0b3023		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5EEC 9800 bytes

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