Malicious PDF — malware analysis report

Static analysis result for SHA-256 90bd67cf2a95d036…

MALICIOUS

PDF

41.9 KB Created: 2020-08-29 23:12:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 252556774eb31728b3494eeac900126d SHA-1: f659026ad285dc9a9b2758227647c97639ada4db SHA-256: 90bd67cf2a95d036798256ee9a58d4c7e4c91b88e92a1a1bcd7ed44f823f4fb6
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external resources, a technique often used for SEO poisoning or to redirect users to malicious sites. The primary malicious link identified is https://ttraff.me/wix?keyword=watch+the+little+prince+online+free, which is flagged as a malicious redirector. The document body, though heavily obfuscated, contains this URL, suggesting an attempt to lure the user into clicking it. The ML classifier strongly supports the malicious verdict.

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.me/wix?keyword=watch+the+little+prince+online+free
    • https://static.usrfiles.com/ugd/b8c837_cf47ea6b1b8442ee9c2bcdc31cafbbe3.pdf
    • https://static.usrfiles.com/ugd/b8c837_7fcb95879de649d8bb2c12d09cf7a545.pdf
    • https://static.usrfiles.com/ugd/b8c837_311d9ff710d54d5ea14d805a016b4f54.pdf
    • https://static.usrfiles.com/ugd/affb4a_64b73ac20bf7474e90b4ec80a0a6cdc5.pdf
    • https://static.usrfiles.com/ugd/7e0eb0_a04c6cf43a0c44d498e058232cf1a3c8.pdf
    • https://cdn.shopify.com/s/files/1/0433/1651/0873/files/19707028051.pdf
    • https://cdn.shopify.com/s/files/1/0443/0443/3308/files/chhattisgarh_road_map.pdf
    • https://cdn.shopify.com/s/files/1/0433/2060/6885/files/16252772190.pdf
    • https://cdn.shopify.com/s/files/1/0429/1588/9305/files/beretta_service_manual.pdf
    • https://cdn.shopify.com/s/files/1/0438/3798/0834/files/57884787810.pdf
    • https://cdn.shopify.com/s/files/1/0439/2953/4632/files/30626162786.pdf
    • https://cdn.shopify.com/s/files/1/0441/2496/2968/files/64179598935.pdf
    • https://cdn.shopify.com/s/files/1/0438/2710/1853/files/fejidekediwozopos.pdf
    • https://cdn.shopify.com/s/files/1/0431/0781/1482/files/64485822204.pdf
    • https://cdn.shopify.com/s/files/1/0433/0130/6526/files/butchery_floor_plan.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_off0000667f.bin
62163efff913b92107f14b0f5bab4701b6f98929f457b128a48b2547b1254c21
pdf-font-stream PDF embedded font (sfnt) at offset 0x667F 4936 bytes
font_01_sfnt_off0000774f.bin
aff0c04ffb6ac79e2572a93c27fe4c7b40ecdb528a7d3d47cef08ba4b430f369
pdf-font-stream PDF embedded font (sfnt) at offset 0x774F 10420 bytes