Malicious PDF — malware analysis report

Static analysis result for SHA-256 8be5501025dde068…

MALICIOUS

PDF

43.1 KB Created: 2020-08-08 20:00:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 89ba736ffb5b0b4877648ffe6ce706a7 SHA-1: f4250d8a4160313a586afcecf3845d2822038cd3 SHA-256: 8be5501025dde0689da7a6de1770c0cb4b9b569c61d3010ea2884983df277f48
120 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to external PDF files. One of the primary links, 'https://ttraff.ru/pify?keyword=biology+mcq+questions+and+answers+pdf', is flagged as a malicious redirector. This indicates a link farm or SEO poisoning attack designed to redirect users to malicious content. The document body, though heavily obfuscated, contains the same URL, reinforcing the malicious intent.

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.ru/pify?keyword=biology+mcq+questions+and+answers+pdf
    • http://files.uniqorner.com/uploads/1/3/1/4/131453522/vasoxiporifez.pdf
    • http://files.pslhsband.com/uploads/1/3/1/4/131407445/kulubosu.pdf
    • http://files.northbaytheatrics.com/uploads/1/3/2/6/132681201/sadoxuvaro.pdf
    • https://cdn.shopify.com/s/files/1/0432/4435/5739/files/43779119655.pdf
    • https://cdn.shopify.com/s/files/1/0428/3210/1543/files/50170699168.pdf
    • https://cdn.shopify.com/s/files/1/0434/0921/1557/files/lovowemid.pdf
    • https://cdn.shopify.com/s/files/1/0431/8730/6658/files/icarus_and_daedalus_story.pdf
    • https://cdn.shopify.com/s/files/1/0434/5282/5750/files/12598912507.pdf
    • https://cdn.shopify.com/s/files/1/0432/9242/6405/files/fusimadipuj.pdf
    • https://cdn.shopify.com/s/files/1/0431/6299/2795/files/xilosawu.pdf
    • https://cdn.shopify.com/s/files/1/0432/8649/5397/files/47737335295.pdf
    • https://cdn.shopify.com/s/files/1/0436/5467/6645/files/bofajizodufazesotog.pdf
    • https://cdn.shopify.com/s/files/1/0431/6423/7988/files/18102586483.pdf
    • https://cdn.shopify.com/s/files/1/0434/3624/5142/files/solid_angle_concept.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_off000066e6.bin
c4d609c5c55009a1d21917f3de5e60d06bc4493d6c2221f899e02c8daf79206e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x66E6 5844 bytes
font_01_sfnt_off00007ace.bin
ae56f68354f5f7504d85cc8f82db71b55a9321a4bdf5af6a4d545513246ae011		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7ACE 11100 bytes

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