Malicious PDF — malware analysis report

Static analysis result for SHA-256 ccccca732f9286e2…

MALICIOUS

PDF

31.7 KB Created: 2020-08-22 04:04:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c2b35767e65cb30991ae63006866495b SHA-1: 93c98798676a7c530384a73ff0ada2fb2175ce2c SHA-256: ccccca732f9286e276b263358db003ec2b4e986923407f9cf385573d27078236
150 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a redirector service (ttraff.ru). This indicates a link farm attack pattern designed to lure users to malicious sites. The ML classifier strongly supports the malicious nature of this PDF.

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.ru/pify?keyword=collections+close+reader+answers
    • http://files.music-in-hospitality.com/uploads/1/3/1/0/131071062/9425927.pdf
    • https://cdn.shopify.com/s/files/1/0433/5042/5753/files/nctb_book_download.pdf
    • https://cdn.shopify.com/s/files/1/0429/5835/6639/files/gumapofisusaxidu.pdf
    • https://cdn.shopify.com/s/files/1/0431/0342/0570/files/al_arabiya_font_free.pdf
    • https://cdn.shopify.com/s/files/1/0435/1036/6362/files/cute_beautiful_baby_images.pdf
    • https://cdn.shopify.com/s/files/1/0433/4832/8603/files/gewukevakosodinotu.pdf
    • https://cdn.shopify.com/s/files/1/0431/7957/3414/files/42_answer_to_meaning_of_life_movie.pdf
    • https://cdn.shopify.com/s/files/1/0436/0205/1229/files/fumoradufuvonidovosano.pdf
    • https://cdn.shopify.com/s/files/1/0437/2119/5669/files/47062471746.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_off000041d1.bin
6357de963b57eef0d0dedea1a274d56d2ce5340e83967072014f4e12099629b9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x41D1 4932 bytes
font_01_sfnt_off000052a4.bin
e207167ac6fcbf2dde622a7b263643188376ca1de8a40d859590b09858951d9f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x52A4 9312 bytes

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