Malicious PDF — malware analysis report

Static analysis result for SHA-256 bce8f1e1e0e62c9f…

MALICIOUS

PDF

45.3 KB Created: 2020-09-04 06:56:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a6a90db03a08f60a925cbbae7c47e714 SHA-1: 1b796181f2b7fae73096c21dd90fa4f615d11076 SHA-256: bce8f1e1e0e62c9f4dcfe472520cd66033eaeb73a6f8b5cdf9d9941b14f1894d
150 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.club, which is disguised as a search result for a technical query. This suggests a social engineering tactic to drive users to a malicious site. The PDF also contains a large number of embedded links, many pointing to static.usrfiles.com, which is flagged as a link farm. The ML classifier strongly indicates maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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=server+2008+certificate+templates+not+showing+up
    • https://static.usrfiles.com/ugd/0010c8_fdeadec6baa14145aa5b583d7c850226.pdf
    • https://static.usrfiles.com/ugd/6f58fb_aa4cd7dd888a4bd08d74ea48d6b0dcc4.pdf
    • https://static.usrfiles.com/ugd/b8c837_437b816604f8413ebdc2ca9ed416a3bf.pdf
    • https://static.usrfiles.com/ugd/5a4aad_1bb084646c7e4e3fa1aaed01b8742bee.pdf
    • https://cdn.shopify.com/s/files/1/0431/7921/2960/files/nozuxex.pdf
    • https://cdn.shopify.com/s/files/1/0431/9831/6705/files/bhagavad_gita_yatharoop_in_kannada.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/nujogopuju.pdf
    • https://cdn.shopify.com/s/files/1/0434/0023/3110/files/adata_su800_firmware.pdf
    • https://cdn.shopify.com/s/files/1/0431/2642/3701/files/jakawoveg.pdf
    • https://cdn.shopify.com/s/files/1/0431/1308/7142/files/eos_1000d_utility_software.pdf
    • https://static.usrfiles.com/ugd/4c3ae3_bcde2bd1622e4387b94c11ad7b570228.pdf
    • https://static.usrfiles.com/ugd/ac51ce_ace970d2788a4a5baf4363b14c951e8a.pdf
    • https://static.usrfiles.com/ugd/bae363_6efc78a41bdf4257acadc238e764c72b.pdf
    • https://static.usrfiles.com/ugd/105a8c_1dca15b5581e4f3b9d625d614626fb82.pdf
    • https://static.usrfiles.com/ugd/f8de3e_2ffe7f4ea7c844ff8c6a3ca0b44b4280.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_off0000700c.bin
7618e3baf9390c05467fbaa27bcf823dbf7d9eb131a65728bcdf0644f321cc5b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x700C 6152 bytes
font_01_sfnt_off000084e8.bin
6737067905663e93a0f91e952801732a6c11ff6288948ed51ab8be60eceb5b8a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x84E8 10280 bytes

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