Malicious PDF — malware analysis report

Static analysis result for SHA-256 462939d8fb7342f6…

MALICIOUS

PDF

49.9 KB Created: 2020-09-02 10:51:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 03d22b165e0389fcbf53fe93b5bf1c00 SHA-1: 2850f69e2eda59d6e97ea957cf1cad8165c9058c SHA-256: 462939d8fb7342f69b3dd49030b6adaea89d0a0bddca37f4e88a529a1050125c
150 Risk Score

Malware Insights

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

The PDF contains a link farm and a specific redirector URL that is flagged as malicious. The document body, though heavily obfuscated, contains the malicious URL and keywords related to software downloads, suggesting a lure. The ML classifier also strongly indicated 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.link/wix?keyword=cadmatic+software+free
    • https://static.usrfiles.com/ugd/c33cdb_50a4a9764591421eb7323f179a6ed0d3.pdf
    • https://static.usrfiles.com/ugd/eb5a6a_bb93e6866d4740ffbd7295c943fff305.pdf
    • https://static.usrfiles.com/ugd/93c935_250d70e0f72442a18ccb1c1272f9cbfe.pdf
    • https://static.usrfiles.com/ugd/6e3131_727cb14a974f45e9ba0ab7919116e027.pdf
    • https://static.usrfiles.com/ugd/b8c837_bc503f24417b462ea3bc3be0090d796d.pdf
    • https://cdn.shopify.com/s/files/1/0431/9353/2573/files/86834687663.pdf
    • https://cdn.shopify.com/s/files/1/0431/3976/0295/files/nimonozewazev.pdf
    • https://cdn.shopify.com/s/files/1/0434/3562/2552/files/jajuzoduvemimidawiraje.pdf
    • https://static.usrfiles.com/ugd/5fd5c1_b3eed2faa5e549d1819c652425a89c5e.pdf
    • https://static.usrfiles.com/ugd/d54300_2265c9c320db47c598c85ff1f15676ae.pdf
    • https://static.usrfiles.com/ugd/cb4a18_7ae8241d419f45f48f7e9f8079d2b9fd.pdf
    • https://cdn.shopify.com/s/files/1/0429/9476/1877/files/65704611473.pdf
    • https://cdn.shopify.com/s/files/1/0437/5789/5841/files/bijubamesa.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007844.bin
6842e94debc45f506f9667523c165cc6431d53004e4e7c20072e2631b2e8e5c4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7844 4932 bytes
font_01_sfnt_off0000891e.bin
0a16e88e1f58ad7e5b1e367cd045694807686c15ffc9e78d5645ac27ca40cc76		 pdf-font-stream PDF embedded font (sfnt) at offset 0x891E 10328 bytes
font_02_sfnt_off0000ac7f.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAC7F 4324 bytes

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