Malicious PDF — malware analysis report

Static analysis result for SHA-256 eacb239bc42c0a2a…

MALICIOUS

PDF

45.4 KB Created: 2020-08-30 11:58:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cbf3a683c4cda227896b3b1c6fd61aa7 SHA-1: 559e8df65590873db1d00e7c24662d311991095f SHA-256: eacb239bc42c0a2a1343a14a0cf72d44f4a06da703520d420e28dab5f0204513
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.001 Malicious Link

The PDF file contains a critical heuristic firing indicating a malicious redirector link. This link, 'https://ttraff.club/wix?keyword=mackie+32.8+precio', is likely part of a phishing or malware distribution scheme. The document also contains a large number of embedded links, many pointing to 'static.usrfiles.com', which is flagged as a link farm. 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.club/wix?keyword=mackie+32.8+precio
    • https://static.usrfiles.com/ugd/60933b_98e9e08e24414b74a6ff23e82e85635b.pdf
    • https://static.usrfiles.com/ugd/b8c837_be3b6c19ec5842778bde5634da6edbf4.pdf
    • https://static.usrfiles.com/ugd/b8c837_5c8b9c234fc9424180aa2cc9a37cbb81.pdf
    • https://static.usrfiles.com/ugd/b8c837_38d88a5e05be4ae1b94398722fe55f31.pdf
    • https://static.usrfiles.com/ugd/a1fb72_4b860d9dc8f549a8a4a51289b89c326e.pdf
    • https://static.usrfiles.com/ugd/b52961_49412dee4f5d481d8d0707db71a47643.pdf
    • https://static.usrfiles.com/ugd/54fa57_12e047e1a90c4447896d3619d46bf654.pdf
    • https://static.usrfiles.com/ugd/9e53d4_f3f54b87e909492aaad916d13a2a351e.pdf
    • https://cdn.shopify.com/s/files/1/0440/1253/5958/files/star_wars_x_wing_miniatures_game_rules.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/71895612735.pdf
    • https://cdn.shopify.com/s/files/1/0429/1634/8057/files/duzebakufunatapirudupu.pdf
    • https://cdn.shopify.com/s/files/1/0457/6087/2604/files/30583252103.pdf
    • https://static.usrfiles.com/ugd/b8c837_434ccc9b8f9e4b3ba382b2214af7b011.pdf
    • https://static.usrfiles.com/ugd/b8c837_b072c06d4a21493abc00cecbcca5bde9.pdf
    • https://static.usrfiles.com/ugd/2274a7_d7065ef3fdf2448abd9b6ceb307b0e10.pdf
    • https://static.usrfiles.com/ugd/b8c837_2150e9f0dea54ed888cc0ed45ba302a3.pdf
    • https://static.usrfiles.com/ugd/5899d5_09560001e6964ba8af171ca7cdd31c7c.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_off00006a8f.bin
bcc9686098bf953cb364b746967bbd7278101b53af8ebb23ddf4fd0966aa1497		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A8F 5308 bytes
font_01_sfnt_off00007cb5.bin
fa109b6f4afe7c2218ed19565c5c03736b77b1740196ff3a92a2b2f2919e610f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7CB5 13744 bytes

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