Malicious PDF — malware analysis report

Static analysis result for SHA-256 2197ca609d50261c…

MALICIOUS

PDF

38.4 KB Created: 2020-09-03 00:05:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 328c07588f68f91633e0462fe9fa730a SHA-1: e7aaa19698c73540cc45dbe67713e48b4241f466 SHA-256: 2197ca609d50261c778a8b34028e4cc5ed549b553127311405d3724b3591b5c2
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.com'. The document body, though heavily obfuscated, contains the same URL, suggesting it's the primary lure. The presence of numerous external links, many pointing to 'static.usrfiles.com', indicates a link farm strategy, likely to improve search engine ranking for the lure. 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.com/pify?keyword=bosch+dishwasher+smu68m05au+repair+manual
    • https://static.usrfiles.com/ugd/b8c837_9d68b757b6564f6597666d79b09c24aa.pdf
    • https://static.usrfiles.com/ugd/8a419d_e8acd631d8d74ee38a2f53cf3cf886da.pdf
    • https://static.usrfiles.com/ugd/fbccce_74eeba281f7e4edb915554f47f3bc482.pdf
    • https://cdn.shopify.com/s/files/1/0465/3980/0734/files/root_checker_apk_for_android.pdf
    • https://static.usrfiles.com/ugd/e643da_0280699a1b6440f28f7e3852395bfa35.pdf
    • https://static.usrfiles.com/ugd/cc03df_227c7efc6b084c1394a5ba43db12edbe.pdf
    • https://static.usrfiles.com/ugd/b8c837_68a9c37930564672906839766e801236.pdf
    • https://static.usrfiles.com/ugd/834936_26a82bb621ff47289ddd0032d794e461.pdf
    • https://static.usrfiles.com/ugd/3aca14_b09a59f206174b30bf457c53012f56b2.pdf
    • https://static.usrfiles.com/ugd/b8c837_6be614b22c3548e18788740c7ce0d049.pdf
    • https://static.usrfiles.com/ugd/c83fdb_2b30b3a0275e49438b112c1acae6fa1e.pdf
    • https://static.usrfiles.com/ugd/efc97f_32981d3a61de442db15fcf33e095cc4e.pdf
    • https://static.usrfiles.com/ugd/afbef4_f2fc09e1eb124e27b741fe475b559e8b.pdf
    • https://static.usrfiles.com/ugd/a18aa6_4a0085b59c774bd891ed1dbea4d5caad.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_off00005826.bin
8da27b84cce7241952166980db4cf56f84f4047d0749735cd2cd15b716e38048		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5826 6068 bytes
font_01_sfnt_off00006cae.bin
a516f2113fc918cbab406fbf984dbe2b74373d93def3a3ae999d501bdc9809a6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6CAE 9664 bytes

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