Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec4c116fc707f97e…

MALICIOUS

PDF

50.6 KB Created: 2020-08-30 01:09:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dc464ac812027ab0190dc900c648a9c7 SHA-1: 502b5563cd8c5f6623a7217c66f8f63f26b4bc0b SHA-256: ec4c116fc707f97e43edaec350fcb901d87c265b9c0dde423c12d5801004c885
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'ttraff.cc'. This URL is presented in the document body with a keyword suggesting a lure for iCloud downloads. The PDF also exhibits characteristics of a link farm, with numerous embedded URLs, many pointing to 'static.usrfiles.com'. The ML classifier strongly flagged this PDF as malicious. The primary attack pattern involves luring the user to a malicious site via a deceptive link.

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=icloudin+download+server
    • https://static.usrfiles.com/ugd/b8c837_47b01ea49aa74de1afedc2d82526b3a0.pdf
    • https://static.usrfiles.com/ugd/93c935_10efc269c82f498894abb67927e36c29.pdf
    • https://static.usrfiles.com/ugd/d2cc1f_f721aa6745c24e6492722d46f1e03b42.pdf
    • https://static.usrfiles.com/ugd/b8c837_fa32e7286ed54b8caacc51df05390803.pdf
    • https://static.usrfiles.com/ugd/cbe7f7_915ca144cbd44ab6bd693284ec528b9e.pdf
    • https://static.usrfiles.com/ugd/b8c837_963a1f0ead924d0b943671f60847e9cf.pdf
    • https://static.usrfiles.com/ugd/98e298_c9cd167c686940e79a537a8cda37b44a.pdf
    • https://static.usrfiles.com/ugd/912de2_25f3ad26558a4b178dfc9e46667073db.pdf
    • https://cdn.shopify.com/s/files/1/0434/1537/1932/files/tapatemuvikepubujaxububet.pdf
    • https://cdn.shopify.com/s/files/1/0429/6107/6375/files/todukegutumuvitibemiki.pdf
    • https://cdn.shopify.com/s/files/1/0441/2289/8584/files/free_architectural_drafting_software.pdf
    • https://static.usrfiles.com/ugd/b8c837_22fff65283ac4b1bbd55ff56bd11aa64.pdf
    • https://static.usrfiles.com/ugd/b52961_b4bd29b6de1242a4b8b5416f18a5bcbd.pdf
    • https://static.usrfiles.com/ugd/b8c837_c5c203be6fd04277a123e4f82d50e7ba.pdf
    • https://static.usrfiles.com/ugd/54fa57_110fa4b12bc64c3aa6e50feb2a2859b4.pdf
    • https://static.usrfiles.com/ugd/b8c837_c190173c940b48559d2cda89728aa1a2.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_off0000739a.bin
282f5d76f5be9efb4859ba043025821bdd08e9dda7fad524c5f0d542859ac0af		 pdf-font-stream PDF embedded font (sfnt) at offset 0x739A 4824 bytes
font_01_sfnt_off00008406.bin
49ded31897e9be935b679e39c0d1558796280ffa43f8163abf6375d827de3470		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8406 13620 bytes
font_02_sfnt_off0000aef2.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAEF2 4324 bytes

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