Malicious PDF — malware analysis report

Static analysis result for SHA-256 42189d08cf0bbbdc…

MALICIOUS

PDF

48.3 KB Created: 2020-08-31 00:29:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 35b7a1121f09a678745fdd20084ab734 SHA-1: 2d0c732f3cf5e2e7981c0b35875d6f6d5a0fbae4 SHA-256: 42189d08cf0bbbdcd31375a35d26a70eed4f1b9d3196402b621e7b69edf03945
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing for PDF_MALICIOUS_REDIRECTOR_LINK, pointing to ttraff.me. The document body, though heavily obfuscated, contains the same redirector URL and references to PDF documents, suggesting a lure to external content. The ML classifier also strongly indicated maliciousness. No scripts were extracted, and the primary malicious activity appears to be redirection to a potentially harmful site.

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=michio+kaku+physics+of+the+impossible
    • https://static.usrfiles.com/ugd/b8c837_8af60d5ed3234506aca823bb21f2a1f5.pdf
    • https://static.usrfiles.com/ugd/b8c837_3ca6f42af8504f15a09752679f7346c2.pdf
    • https://static.usrfiles.com/ugd/b8c837_080dccfeb0af425a81cff814dfa737ab.pdf
    • https://static.usrfiles.com/ugd/cf14a4_59d880a7c66f4c6fa811884bec644afc.pdf
    • https://static.usrfiles.com/ugd/b8c837_d4596a7deb9a4e2b80d4de45785102e6.pdf
    • https://cdn.shopify.com/s/files/1/0428/8849/5270/files/avengers_infinity_war_script.pdf
    • https://cdn.shopify.com/s/files/1/0430/6350/9146/files/34872110794.pdf
    • https://cdn.shopify.com/s/files/1/0432/7492/8286/files/hidan_vs_asuma_episode_berapa.pdf
    • https://static.usrfiles.com/ugd/e1c37d_a43b8ea13aa54a65b8162d76ed032d1d.pdf
    • https://static.usrfiles.com/ugd/06497e_1e6626b391584358826854f53f46013d.pdf
    • https://static.usrfiles.com/ugd/b8c837_d424ac2844b1474390a801dd8b290f2a.pdf
    • https://static.usrfiles.com/ugd/b8c837_f7faf0c4d8464fb0b9004b021cb2f28d.pdf
    • https://static.usrfiles.com/ugd/89363e_30d27f25b4cf4f3093291a52be97d2ba.pdf
    • https://cdn.shopify.com/s/files/1/0435/3294/3519/files/nebaxerexuterusa.pdf
    • https://cdn.shopify.com/s/files/1/0432/7977/7952/files/tapabeposadavejetem.pdf
    • https://cdn.shopify.com/s/files/1/0434/5158/0568/files/22939011985.pdf
    • https://cdn.shopify.com/s/files/1/0435/8933/7256/files/blast_furnace_slag_cement.pdf
    • https://cdn.shopify.com/s/files/1/0432/2046/7869/files/4294420242.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_off000070dd.bin
34859b497f6472c4ebc0387a784e1b2adeacca4355f2ed3cdfe026746b7e4c51		 pdf-font-stream PDF embedded font (sfnt) at offset 0x70DD 5244 bytes
font_01_sfnt_off000082c6.bin
a53d3d6e092cea771d5a7ee6c196d105631178382dea9ee547729ce47a631c20		 pdf-font-stream PDF embedded font (sfnt) at offset 0x82C6 10220 bytes
font_02_sfnt_off0000a5b9.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA5B9 4324 bytes

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