Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c27b82bab93cf47…

MALICIOUS

PDF

53.3 KB Created: 2020-08-30 19:10:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: abeab53e5bb4fa15e07d2236c84379c7 SHA-1: 1dd123c4a6504be18adec6d4873e2eaa5f52a9c8 SHA-256: 8c27b82bab93cf472d079b5f91ab4d43049d63ef978c0cc5500f52109b31c531
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF file contains a critical heuristic firing for a malicious redirector link pointing to 'https://ttraff.ru/wix?keyword=orphic+hymns+pdf'. Additionally, it exhibits characteristics of a PDF SEO link farm, with numerous embedded links. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains the same redirector URL, suggesting the primary intent is to lure the user to a malicious site.

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.ru/wix?keyword=orphic+hymns+pdf
    • https://cdn.shopify.com/s/files/1/0434/0819/5738/files/47077507788.pdf
    • https://cdn.shopify.com/s/files/1/0433/0127/3758/files/nefadawedexej.pdf
    • https://cdn.shopify.com/s/files/1/0436/9596/4314/files/3580074971.pdf
    • https://static.usrfiles.com/ugd/b77b08_ee238738036b4643a08342893151db94.pdf
    • https://static.usrfiles.com/ugd/b8c837_f7ab4f29fb2a47d6b67267b97015b512.pdf
    • https://static.usrfiles.com/ugd/b8c837_cd37b76d2ec74490b5eea5eed756c6b8.pdf
    • https://cdn.shopify.com/s/files/1/0428/1411/1903/files/veruget.pdf
    • https://cdn.shopify.com/s/files/1/0431/9179/5873/files/tuxipevem.pdf
    • https://cdn.shopify.com/s/files/1/0461/9426/2166/files/arere_ekkada_ekkada_karaoke_song.pdf
    • https://static.usrfiles.com/ugd/b8c837_f52213360b5940f59a8611a098400615.pdf
    • https://static.usrfiles.com/ugd/b8c837_7ee74ab9be734382adc4f1d9a70bd5dd.pdf
    • https://static.usrfiles.com/ugd/d01287_6fc1c89bd5e34615be41754b5cb7ca73.pdf
    • https://static.usrfiles.com/ugd/a467d2_e04ba689c6034996b6282ae3b154aa27.pdf
    • https://static.usrfiles.com/ugd/ce0e6d_591c57f482e1406d9b9226f41eda7be0.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_off00008d97.bin
a8125ea351b4f7fd4dcdc1c39d1bf25776a88b029ce24d7a4802e329668b701a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8D97 5280 bytes
font_01_sfnt_off00009f6d.bin
e853812e6bed754de194cfa48619fbbaeef13148e8b798c87254f3c92ba0bcac		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9F6D 12032 bytes

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