Malicious PDF — malware analysis report

Static analysis result for SHA-256 472c89c07d0d61a6…

MALICIOUS

PDF

35.9 KB Created: 2020-08-09 12:32:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a75cd25e67a9c7e7e25cd0aacee68425 SHA-1: 4deb5ef21aad3bad6732316bc71934f78ac1ad60 SHA-256: 472c89c07d0d61a65e0238b835c12a688b56d103ad27c5ec3e68b6c1c502f98f
150 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to what appears to be a link farm designed to mimic academic resources. One prominent link, 'https://ttraff.ru/pify?keyword=introductory+mathematical+analysis+for+business+economics+and+social+sciences+pdf', is flagged as a malicious redirector. The ML classifier also strongly indicated maliciousness.

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=introductory+mathematical+analysis+for+business+economics+and+social+sciences+pdf
    • http://files.ringettegoalies.com/uploads/1/3/1/1/131164573/310de42a46f.pdf
    • http://files.artbysarabardin.com/uploads/1/3/0/7/130776602/gusimorutojemuro.pdf
    • http://files.telderberries.com/uploads/1/3/1/4/131406659/zawilit_nexodesawuguri_ginezunuluvi_daladakusama.pdf
    • http://files.louisburghistoricdistrict.com/uploads/1/3/1/3/131383977/lapomumusel-renuj.pdf
    • http://difarur.torysvintagesleds.com/uploads/1/3/0/8/130874330/guwelesexet.pdf
    • https://cdn.shopify.com/s/files/1/0429/8889/6415/files/ahs_season_6_online_free.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/19441108854.pdf
    • https://cdn.shopify.com/s/files/1/0429/5802/8959/files/rukukowelenitezudezobiv.pdf
    • https://cdn.shopify.com/s/files/1/0433/8502/8758/files/15936325417.pdf
    • https://cdn.shopify.com/s/files/1/0434/6842/3334/files/93220203679.pdf
    • https://cdn.shopify.com/s/files/1/0430/2353/2195/files/11240257564.pdf
    • https://cdn.shopify.com/s/files/1/0440/5267/6773/files/32811504956.pdf
    • https://cdn.shopify.com/s/files/1/0435/3431/9776/files/segelof.pdf
    • https://cdn.shopify.com/s/files/1/0434/6285/2773/files/90300449659.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_off00004e4a.bin
278384e39e859b5e431667a281df7211de127d891e01c333b8b6fd2541714e2f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4E4A 5576 bytes
font_01_sfnt_off00006111.bin
2225a50b21ec90c76e3110f60c95889037e8576f6a32fb49770f91854c849cd1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6111 9676 bytes

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