Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd5702246dabaef2…

MALICIOUS

PDF

53.5 KB Created: 2020-09-03 08:18:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4a49fab1d916bd558af0384e5c3e138a SHA-1: f9f707841be51b3c6364711f64291b28c95a69b5 SHA-256: bd5702246dabaef2fd9d6943fb45f663c67e9ff0da46e3b1c8b9ba317941cda3
120 Risk Score

Malware Insights

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

The PDF file contains a heuristic firing for a malicious redirector link, specifically pointing to 'https://ttraff.link/wix?keyword=biomedical+informatics+journal+impact+factor'. The document body, though heavily obfuscated, also contains this URL and references to 'Biomedical informatics journal impact factor', suggesting a lure to trick users into clicking the malicious link. The file also exhibits characteristics of a link farm, with numerous external PDF links, many of which point to benign content but are likely used to obscure the malicious redirector.

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.link/wix?keyword=biomedical+informatics+journal+impact+factor
    • https://static.usrfiles.com/ugd/8cbfce_669c4483337c47809c420a5cf81ea70e.pdf
    • https://static.usrfiles.com/ugd/b8c837_a2876952825b457697e95e261c323dd3.pdf
    • https://static.usrfiles.com/ugd/74c34a_6fa2732c97ae42289686af1a605f517b.pdf
    • https://static.usrfiles.com/ugd/89c6ad_3cae72184e8f47a5a0b75125899cca8c.pdf
    • https://static.usrfiles.com/ugd/b8c837_6428d094ffd544ac8253c4fc7f9177d9.pdf
    • https://cdn.shopify.com/s/files/1/0435/1633/0152/files/lokoreladule.pdf
    • https://cdn.shopify.com/s/files/1/0433/2571/8678/files/kanozi.pdf
    • https://cdn.shopify.com/s/files/1/0437/4750/8385/files/ceaseless_discharge_boss_guide.pdf
    • https://cdn.shopify.com/s/files/1/0428/5136/9127/files/maxidetatekeguwabo.pdf
    • https://cdn.shopify.com/s/files/1/0461/1116/2531/files/60176498214.pdf
    • https://cdn.shopify.com/s/files/1/0431/8747/0496/files/cognitive_behavioral_theory_model.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_off00008a15.bin
f7f586098fec64e468ecdc4b0488486eb2ac7a55f4789dace62da625640bc15e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8A15 5428 bytes
font_01_sfnt_off00009c79.bin
f1768b63e8b0321b32c741fbc95608a47ba571e2e77c7cb4a9790f37022fd57b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9C79 14192 bytes

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