Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8d658ce2f7999d3…

MALICIOUS

PDF

47.2 KB Created: 2020-08-30 19:48:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5d55147d266964bfc07015049260f715 SHA-1: be7f7365f44af531e8218759244592d94af91167 SHA-256: d8d658ce2f7999d363a9bfb762ce55f2e24bcf212d0c4c25d39ff531f33ccfd4
120 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, specifically pointing to 'https://ttraff.ru/wix?keyword=hollow+knight+quirrel+comic'. This indicates a social engineering attempt to lure the user to a malicious site. The document also contains a large number of embedded links, flagged as a PDF link farm, which is a common tactic for SEO poisoning or distributing malicious content. No scripts were extracted, but the presence of the malicious redirector is sufficient evidence for a high confidence assessment.

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=hollow+knight+quirrel+comic
    • https://static.usrfiles.com/ugd/edb4a7_da92c7669b554bf0a849f41ee50fedb4.pdf
    • https://static.usrfiles.com/ugd/b8c837_dd3f338279524cbdb4d0238203f1e331.pdf
    • https://static.usrfiles.com/ugd/158fb9_e67202d41c064e6bac4bdfb36aedc65d.pdf
    • https://static.usrfiles.com/ugd/b8c837_473a88f600f445a1aba8ba4fff4a6b36.pdf
    • https://static.usrfiles.com/ugd/b13fd1_4e7e2ddc7f1d4fab9edb36113e8d7240.pdf
    • https://cdn.shopify.com/s/files/1/0434/7074/9861/files/converting_customary_units_of_weight_worksheet_answers.pdf
    • https://cdn.shopify.com/s/files/1/0432/7469/8902/files/panotawelomoredosusul.pdf
    • https://cdn.shopify.com/s/files/1/0432/2492/4319/files/zebawitanovili.pdf
    • https://cdn.shopify.com/s/files/1/0439/0351/6824/files/gujarati_books_free_download.pdf
    • https://static.usrfiles.com/ugd/b8c837_6366e65a4a3b459eb9fa0198f48752ea.pdf
    • https://static.usrfiles.com/ugd/fbccce_20f456b3495941e9bb276d8a68bcb9d6.pdf
    • https://static.usrfiles.com/ugd/704566_7490face56fb473daa23912d31f115a4.pdf
    • https://cdn.shopify.com/s/files/1/0430/8893/7120/files/viwefebanup.pdf
    • https://cdn.shopify.com/s/files/1/0428/5700/5215/files/61318761343.pdf
    • https://cdn.shopify.com/s/files/1/0462/0058/6398/files/35720511729.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_off00007d05.bin
429da77595e432cb51e34534bbfddd9cd474fed152453e93042cdff0fccbeec0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7D05 5068 bytes
font_01_sfnt_off00008e23.bin
9731e2604ac5fff8c501d932a9fcf38ebcfa81efc886350b3c03940c197ed285		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8E23 9936 bytes

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