Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc74dce261203913…

MALICIOUS

PDF

41.5 KB Created: 2020-09-02 00:33:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 16fb8e645a821991b57a6ce279cbf289 SHA-1: beebd06f2621ced9ca2db879b371779c33d49fc8 SHA-256: bc74dce261203913636c9eadfea9fa0c2a9c0da95c53c7feaa778ece88fef945
152 Risk Score

Malware Insights

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

The PDF document was flagged as malicious by an ML classifier and contains a link farm with 16 external PDF links. One of the primary links, 'https://ttraff.ru/wix?keyword=bahubali+2+video++mp4', is identified as a known malicious redirector. The document body contains garbled text but includes the same malicious URL, suggesting an attempt to lure users to a malicious site. No scripts were extracted from this sample.

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.ru/wix?keyword=bahubali+2+video++mp4
    • https://cdn.shopify.com/s/files/1/0437/9305/5904/files/bodensee_radweg_karte.pdf
    • https://cdn.shopify.com/s/files/1/0431/6839/9524/files/60205655324.pdf
    • https://cdn.shopify.com/s/files/1/0436/9917/5579/files/dijexuxamifo.pdf
    • https://static.usrfiles.com/ugd/0511f5_e69d041b5a9e4493841ce8ce71641d0e.pdf
    • https://static.usrfiles.com/ugd/b8c837_fb4d1231028042aa8fe9fca92ba0e1e0.pdf
    • https://static.usrfiles.com/ugd/b8c837_8ff460a1e14c4c8c9458a8e6829bc181.pdf
    • https://static.usrfiles.com/ugd/d5415a_6909c9a568c34071af4e291e3b54f5af.pdf
    • https://cdn.shopify.com/s/files/1/0433/4272/5275/files/45363699601.pdf
    • https://cdn.shopify.com/s/files/1/0432/5857/7064/files/depimol.pdf
    • https://cdn.shopify.com/s/files/1/0439/7439/4014/files/regulaciones_y_restricciones_arancelarias_y_no_arancelarias.pdf
    • https://cdn.shopify.com/s/files/1/0431/6243/5739/files/36475807862.pdf
    • https://static.usrfiles.com/ugd/3cb679_a3463ee9a5134e4588ef374bcd2e0196.pdf
    • https://static.usrfiles.com/ugd/4f92c1_4fca853370ba4de1b2d809fb86243472.pdf
    • https://static.usrfiles.com/ugd/5cf23b_d21a5b28c7104b80bb69279661603f98.pdf
    • https://static.usrfiles.com/ugd/ed64d2_fefbaaebe2da4f74bfed46b0b2964802.pdf
    • https://static.usrfiles.com/ugd/3e87bf_bc06670cbbc444fd851c80912934108d.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_off000063a7.bin
fec7dff151da0f77418825539427a77c1cb9bea3d8215bac8c93650713ea8dcf
pdf-font-stream PDF embedded font (sfnt) at offset 0x63A7 5396 bytes
font_01_sfnt_off000075e7.bin
fad2bf84fe765e65dc6224b4e52359641f365b312608193df83bbdb587e13885
pdf-font-stream PDF embedded font (sfnt) at offset 0x75E7 10472 bytes