Malicious PDF — malware analysis report

Static analysis result for SHA-256 e31a1305f453f1c4…

MALICIOUS

PDF

41.3 KB Created: 2020-08-18 14:31:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e530ec4fdc8ddd0db2dfb6cd7256118d SHA-1: 73c45ce207136ee67a556823a540e169f8173af1 SHA-256: e31a1305f453f1c4e9d502648dafb139ea1d3a5f563072fa3f27eee2547e5cf4
162 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'ttraff.com'. The document body, though heavily obfuscated, contains the text 'Dictionary free offline' and the malicious URL, suggesting a lure. The PDF also contains a mass external PDF link farm, with many links hosted on cdn.shopify.com, and a heuristic indicating a browser extension installation lure. The primary malicious IOC is the redirector URL.

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.
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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.com/pify?keyword=dictionary++free+offline
    • http://files.rami-khushaba.com/uploads/1/3/0/7/130775223/jovedirexevamotinuv.pdf
    • https://cdn.shopify.com/s/files/1/0433/4272/5275/files/zixevusilapejagofazu.pdf
    • https://cdn.shopify.com/s/files/1/0429/0723/8567/files/botazo.pdf
    • https://cdn.shopify.com/s/files/1/0430/4591/2727/files/download_free_romance_books_online.pdf
    • https://cdn.shopify.com/s/files/1/0437/9095/8749/files/brownian_motion_notes.pdf
    • https://cdn.shopify.com/s/files/1/0433/3142/0319/files/beekeeping_at_buckfast_abbey.pdf
    • https://cdn.shopify.com/s/files/1/0439/4188/8155/files/48673477995.pdf
    • https://cdn.shopify.com/s/files/1/0428/1230/9671/files/45602050689.pdf
    • https://cdn.shopify.com/s/files/1/0427/4615/1078/files/72689842982.pdf
    • https://cdn.shopify.com/s/files/1/0433/8240/7318/files/60769164305.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/30106301206.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_off000065aa.bin
a2696d561454453bc09692d3c4d96bfc2b71640cc7bba83d0b1d740f68a8fed9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x65AA 4800 bytes
font_01_sfnt_off00007612.bin
d30ed724d7fc0b0ea9a2160656e31c88a4fba0de7be026122c5effa8d4b4f579		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7612 10228 bytes

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