Malicious PDF — malware analysis report

Static analysis result for SHA-256 a58bdba826c0842a…

MALICIOUS

PDF

39.1 KB Created: 2020-08-19 20:15:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9f50b85a436da4e0066ab69ad11ba30a SHA-1: 699e59bbe418feca7871046ccb4dff1715304d6a SHA-256: a58bdba826c0842a27cb83b5a2aeee2598943f056fb4041dd7d03847ffc984c8
150 Risk Score

Malware Insights

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

The PDF contains a deceptive link presented as exam questions, which redirects to a known malicious URL. The document body is heavily obfuscated but contains the visible lure text and the malicious URL. The PDF was flagged by a critical heuristic for linking to malicious redirector infrastructure and by another for being a link farm.

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=epidemiology+study+design+exam+questions+and+answers
    • http://kiwegam.romans-group.com/uploads/1/3/0/7/130775380/ad4995117eb5f92.pdf
    • http://files.identefamilyusa.org/uploads/1/3/1/4/131407135/mavonawezapanifu.pdf
    • http://files.redesignforwholefamilies.com/uploads/1/3/1/8/131857193/jowudakavesof-rusodisoton-zofokizubolas.pdf
    • http://files.anchortours.ca/uploads/1/3/2/6/132681576/2179923.pdf
    • http://files.codyrooney.com/uploads/1/3/0/8/130814192/fajad-kexuvepokamiv-nijanot.pdf
    • https://cdn.shopify.com/s/files/1/0431/6889/1040/files/73389878852.pdf
    • https://cdn.shopify.com/s/files/1/0428/9318/1081/files/99226693213.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/86399573169.pdf
    • https://cdn.shopify.com/s/files/1/0436/3649/0398/files/16973870140.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/xasojikunu.pdf
    • https://cdn.shopify.com/s/files/1/0429/8814/2743/files/15289793679.pdf
    • https://cdn.shopify.com/s/files/1/0432/8790/4422/files/bodybuilding_workout_video_free.pdf
    • https://cdn.shopify.com/s/files/1/0431/6761/3087/files/clash_of_clans_trip_games_apk.pdf
    • https://cdn.shopify.com/s/files/1/0435/5850/2563/files/wopil.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_off000059ed.bin
d972910f92c5edadb19a6755c69597ec34515a24769381655c93f4d3c6d5d425		 pdf-font-stream PDF embedded font (sfnt) at offset 0x59ED 5624 bytes
font_01_sfnt_off00006d1f.bin
3a22106178afb29d503d77be8f83c88b27aba0d0699e714f8c493d976881aa5f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D1F 10212 bytes

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