Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d0dfebfce71eb85…

MALICIOUS

PDF

37.7 KB Created: 2020-09-02 00:19:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0b36c55bdb4777c73bda60b8d45cb539 SHA-1: fb785f2e0bd4abfa49b9dd8ecbe4d8ababf7309c SHA-256: 7d0dfebfce71eb850f36bcd174ec1fbea11852270bf0f36367963ef533d01355
150 Risk Score

Malware Insights

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

This PDF file contains a link to a known malicious redirector, ttraff.ru, which is likely used to deliver further malicious content. The document body, though heavily obfuscated, contains text related to 'delete browsing history chrome android' and the URL itself, suggesting a social engineering lure. The presence of a large number of external PDF links also indicates a link farm, a common tactic for SEO poisoning or distributing malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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/pify?keyword=delete+browsing+history+chrome+android
    • https://static.usrfiles.com/ugd/3eed2b_7a31a4f451ea4912a96159dc45866bd6.pdf
    • https://static.usrfiles.com/ugd/f35da0_ccf3db72bd13411c9afb05572ebf061d.pdf
    • https://static.usrfiles.com/ugd/f3ecbe_ee0685a011f744f09cde025fd694596f.pdf
    • https://static.usrfiles.com/ugd/b8c837_0b122d1407784170ad390c36a3b2e51e.pdf
    • https://static.usrfiles.com/ugd/3bcfef_e5b226bef714498fa43e19b59eaf0e9c.pdf
    • https://static.usrfiles.com/ugd/0f5b72_5010526021c14a84b1a32ac5e34ccc9e.pdf
    • https://static.usrfiles.com/ugd/87a178_a0e6e11852ed4a03bfcb7c84f553591c.pdf
    • https://static.usrfiles.com/ugd/0f5b72_bb1e2397baa64d14886d143028737752.pdf
    • https://cdn.shopify.com/s/files/1/0432/2174/5822/files/matlab_installation_guide.pdf
    • https://cdn.shopify.com/s/files/1/0430/9997/9930/files/wutelekatumulapugiwed.pdf
    • https://cdn.shopify.com/s/files/1/0430/1455/3763/files/toefl_grammar_exercises_with_answers.pdf
    • https://static.usrfiles.com/ugd/2ac701_647624545dc846039c866460036b6ea7.pdf
    • https://static.usrfiles.com/ugd/12daa7_3750ed2c29244e5f9ebad975423e9fcf.pdf
    • https://static.usrfiles.com/ugd/38eac1_8223f2a06f4e46a4ab4d6f90f251612f.pdf
    • https://static.usrfiles.com/ugd/b8c837_994f233a8f7142e2aa9eb3e797c90b38.pdf

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005e03.bin
28cfa5a27c569e8f5e2469851a28959025e34f27096865dc9f57b18b326c84ac		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E03 5688 bytes
font_01_sfnt_off00007142.bin
47217984e52c1c806cd60ee7142a3c1ae53e0ca7c91060cda6329c8c5dcdcf16		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7142 9996 bytes

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