Malicious PDF — malware analysis report

Static analysis result for SHA-256 db631d18162b27b0…

MALICIOUS

PDF

33.3 KB Created: 2020-09-01 03:54:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f2281ff014fe9e3426e9621e32addf75 SHA-1: d919fe1aad5a461ce0ce237f50d67353bff258a6 SHA-256: db631d18162b27b0c545f000a8cf587f891a663d00823d224edf8308acaffaa3
152 Risk Score

Malware Insights

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

The PDF contains embedded links, one of which, 'https://ttraff.ru/wix?keyword=badal+movie++khatrimaza', is flagged as a malicious redirector. The document body, though heavily obfuscated, appears to contain this URL and other benign-looking PDF links, suggesting a lure to a malicious site. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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=badal+movie++khatrimaza
    • https://static.usrfiles.com/ugd/a18aa6_7ab0d6ae593f470182b023fd9c616d70.pdf
    • https://static.usrfiles.com/ugd/2f8cea_d35ba0d2e7ff425e865da510fac3aada.pdf
    • https://static.usrfiles.com/ugd/9374a7_15fb7ccf93ab42e1b5c0e3b188ff6a2a.pdf
    • https://static.usrfiles.com/ugd/c1108c_eccb846e0606401d93f2d4651cc61adc.pdf
    • https://static.usrfiles.com/ugd/6c98bc_04b5b17bf6ec491ba8da28e4788dd5d5.pdf
    • https://static.usrfiles.com/ugd/822ecd_8b6069793d4c434b940ea378e0d6b2e5.pdf
    • https://cdn.shopify.com/s/files/1/0435/9425/2456/files/malapipotigipezife.pdf
    • https://cdn.shopify.com/s/files/1/0430/8733/1481/files/22025419230.pdf
    • https://static.usrfiles.com/ugd/db93e9_6b0ceffd056947cba8a00b1de77e28f6.pdf
    • https://static.usrfiles.com/ugd/f3ecbe_506bf04d10e44f14bb4dd12dfc336cc2.pdf
    • https://static.usrfiles.com/ugd/b8c837_1cbcdd66fa46440fabbe87efdfb1d3b1.pdf
    • https://static.usrfiles.com/ugd/07ef24_c8c6ddf4f82a468080ab42918232dff3.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_off000044e3.bin
6ee86327812f687edc8e65a4ab5ec9e2d38b0eb5c7cfdf8eb6651c24eb86906d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x44E3 5108 bytes
font_01_sfnt_off00005623.bin
b928ea729034d1d6fb5dd9298191074143a12babdb838e653f93214ad386d074		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5623 10144 bytes

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