Malicious PDF — malware analysis report

Static analysis result for SHA-256 429bb2d5c41eeb15…

MALICIOUS

PDF

55.2 KB Created: 2020-09-02 23:42:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 345d45b11c9c40b327b8d468d9ca9f60 SHA-1: 374f0a1a4f2a15f0cfd916f85e54212949e9222b SHA-256: 429bb2d5c41eeb15917e67b68f439c09cb7a8caf49620bb731c19f9110eaabfc
152 Risk Score

Malware Insights

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

The PDF contains a link that redirects to a malicious URL, disguised with a keyword related to 'Ny times magazine puzzle answers'. This indicates a phishing or scam attempt. The ML classifier strongly flagged this PDF as malicious, and the presence of a redirector link further supports this assessment. No scripts were extracted, but the document body and embedded links clearly point to a malicious redirection attempt.

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=ny+times+magazine+puzzle+answers
    • https://static.usrfiles.com/ugd/e3ff21_808f06ba154e4776bd42692f0e85671e.pdf
    • https://static.usrfiles.com/ugd/e3ed1f_31fce6b1bda848dc8aee2b37b5746c0f.pdf
    • https://static.usrfiles.com/ugd/ea78e0_f10a34b3bc614401b5fb30931f35f67b.pdf
    • https://static.usrfiles.com/ugd/2274a7_d72def2a943b4e0d9a02d0641b527ad7.pdf
    • https://static.usrfiles.com/ugd/902d29_6ebc2bd044a14bbbbed1a6c8ca03770b.pdf
    • https://static.usrfiles.com/ugd/b8c837_b89b70d13faa442ebdba2253dfcfa388.pdf
    • https://static.usrfiles.com/ugd/b8c837_ce1e48244c014206ba6b39bce20c7902.pdf
    • https://static.usrfiles.com/ugd/40b9e6_bebbb2b58cfa493992a8cce85976a7da.pdf
    • https://cdn.shopify.com/s/files/1/0428/7892/7014/files/wakapibovu.pdf
    • https://cdn.shopify.com/s/files/1/0434/5213/7622/files/ios_13_ipados_beta_profile.pdf
    • https://cdn.shopify.com/s/files/1/0431/7731/2411/files/76359274268.pdf
    • https://cdn.shopify.com/s/files/1/0439/5050/6152/files/the_cask_of_amontillado_analysis.pdf
    • https://cdn.shopify.com/s/files/1/0429/1713/4499/files/candido_portinari_biografia.pdf
    • https://static.usrfiles.com/ugd/b8c837_762337e21b2b4b40bb75596da384d484.pdf
    • https://static.usrfiles.com/ugd/b8c837_be3b6c19ec5842778bde5634da6edbf4.pdf
    • https://static.usrfiles.com/ugd/b8c837_bc75df98817d440eaba87af0d092cd52.pdf
    • https://static.usrfiles.com/ugd/2c7c49_aab3df853da548339e9c8e8ab38829f7.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
stream_006_off0000b411.bin
bc3fe54e2f1dee6e00dc8f9d75187726d9e3ba1b91bc05be3a566acbe28c6ec3		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0xB411 17788 bytes
font_00_sfnt_off00007e40.bin
761e2cac92b434ce33d645d63bbadee5554ef53a166dde5de84f764f9e6f4395		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7E40 5352 bytes
font_01_sfnt_off00009086.bin
041ddd965f20af6533a06f8567c7b7b0c5f2295912baef133f58bc91a6919937		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9086 10376 bytes

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