Malicious PDF — malware analysis report

Static analysis result for SHA-256 88b5d7e53b77a205…

MALICIOUS

PDF

37.3 KB Created: 2020-08-17 12:23:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9bb95b22c34b4ddda005e72db66d11d9 SHA-1: 3db1a9f002906d74ca47f0285b7517ad75048253 SHA-256: 88b5d7e53b77a205637df210612690ccc17d296fd2652d3da20e199f7c7f4e7e
150 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, many of which point to a redirector service (ttraff.cc). This indicates a link farm designed to obscure the final destination and potentially lure users to malicious sites. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the presence of a malicious redirector URL is a high-priority indicator.

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.cc/pify?keyword=tri+fold+brochure+template+google+slides
    • http://files.12utct.com/uploads/1/3/2/8/132814342/908623.pdf
    • http://files.dougalfineart.com/uploads/1/3/0/7/130738499/1566563.pdf
    • https://cdn.shopify.com/s/files/1/0434/0393/5902/files/86259342442.pdf
    • https://cdn.shopify.com/s/files/1/0430/2821/8010/files/the_bible_niv_online.pdf
    • https://cdn.shopify.com/s/files/1/0433/1392/2206/files/jubasaruji.pdf
    • https://cdn.shopify.com/s/files/1/0432/9262/3013/files/lafiju.pdf
    • https://cdn.shopify.com/s/files/1/0437/4839/3112/files/40174108984.pdf
    • https://cdn.shopify.com/s/files/1/0428/8770/8825/files/favaduladu.pdf
    • https://cdn.shopify.com/s/files/1/0431/8242/4215/files/letajoxavumezalexani.pdf
    • https://cdn.shopify.com/s/files/1/0436/5503/7093/files/pudizifif.pdf
    • https://cdn.shopify.com/s/files/1/0437/3217/2965/files/jimoxoku.pdf
    • https://cdn.shopify.com/s/files/1/0445/8368/2212/files/cesar_aira_la_guerra_de_los_gimnasios.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_off000051ed.bin
a79c5e6a4a1f093b2e4b5c2264dac27268bdeba7cbc4c77f2d1e77ff7f30bca0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x51ED 5660 bytes
font_01_sfnt_off000064ff.bin
ae422d4bc3c5fd6c981e04494c44fffbf9db82fbb26d823d9543798c1434d918		 pdf-font-stream PDF embedded font (sfnt) at offset 0x64FF 10560 bytes

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