Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef39e0c94929f655…

MALICIOUS

PDF

44.1 KB Created: 2020-08-30 04:43:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: de415507c15ad894e1155e6e36b6b094 SHA-1: c60cb0369fcc660621314dd3f9f291993c4dc1f6 SHA-256: ef39e0c94929f6556cca7daec28c701ed3b50fa0b4b691a7a51af61b298763da
154 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.cc, disguised as a proposal template. This heuristic firing, combined with the ML classifier's high confidence, indicates a malicious intent to redirect the user to further malicious content. The document body itself is heavily obfuscated but contains the malicious URL.

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.cc/wix?keyword=proposal+template+indesign
    • https://static.usrfiles.com/ugd/89c6ad_a73d4c5b92a045f1b6fc18078c6057aa.pdf
    • https://static.usrfiles.com/ugd/b8c837_d1a0524a9f584f0da625c5b62bf4d946.pdf
    • https://static.usrfiles.com/ugd/c7a620_43be53d2fda94bcebc4ad435e96959a4.pdf
    • https://static.usrfiles.com/ugd/b8c837_d4a6c7a69c2843b4933d898239a0068e.pdf
    • https://static.usrfiles.com/ugd/0d2908_791c497e694e4e34a309131fee97af8a.pdf
    • https://cdn.shopify.com/s/files/1/0447/7576/8221/files/about_a_boy_full_book.pdf
    • https://cdn.shopify.com/s/files/1/0428/2338/5247/files/41128240992.pdf
    • https://cdn.shopify.com/s/files/1/0435/8491/3565/files/valiant_force_building_guide_2017.pdf
    • https://cdn.shopify.com/s/files/1/0429/8512/8090/files/feturasejoxaxuzaratu.pdf
    • https://cdn.shopify.com/s/files/1/0437/6756/2391/files/wanagok.pdf
    • https://cdn.shopify.com/s/files/1/0433/4472/4133/files/lipunuwejo.pdf
    • https://cdn.shopify.com/s/files/1/0430/0144/6554/files/wasemiwoxobinexu.pdf
    • https://cdn.shopify.com/s/files/1/0431/1993/5655/files/66851914466.pdf
    • https://static.usrfiles.com/ugd/4b7290_a23c4d72568e4e218c197deb43f256a0.pdf
    • https://static.usrfiles.com/ugd/8cbfce_ee05fc7993f6481cbd5d382a8c4ad6a7.pdf
    • https://static.usrfiles.com/ugd/4d400c_aebad64957434d9c9fa3e1a3b2a275da.pdf
    • https://static.usrfiles.com/ugd/9c43ec_1f7058aaadf74d249e2174b7a1263d91.pdf
    • https://static.usrfiles.com/ugd/de3d83_ad3a445c3ad24dc1b5bc3fcc0893fb2c.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_off00006f9c.bin
e2e8164909fef338d0acfa9f0d6bc86ecdc9fd86de36b722f04aa9334b0f6f5f
pdf-font-stream PDF embedded font (sfnt) at offset 0x6F9C 5280 bytes
font_01_sfnt_off00008170.bin
4a52392aa024ec23dec710d85150aa0037ba5acd909102b44b5da63c495c301a
pdf-font-stream PDF embedded font (sfnt) at offset 0x8170 10024 bytes