Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a0e243c77bd21f0…

MALICIOUS

PDF

41.3 KB Created: 2020-10-05 12:20:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c113c8a71e3ddd9383d45028b054a0a7 SHA-1: 1628943e1d7a94842083234dd688588e2292b097 SHA-256: 3a0e243c77bd21f09e62d9a27cac640b3555bed74ad2c22afb2587e18a48d526
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

This PDF document contains a large number of embedded links, many of which point to benign Shopify domains, but one critical link directs to a known malicious redirector infrastructure at https://cctraff.ru/strik. The presence of this malicious link, combined with the ML classifier flagging this PDF as malicious, indicates a likely attempt to redirect the user to a harmful site. The document body itself is heavily obfuscated and appears to contain the malicious URLs.

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://cctraff.ru/strik?keyword=can+you+feel+the+love+tonight+chords+piano+pdf
    • http://files.movitzgroup.com/uploads/1/3/1/8/131857580/lisakikiru.pdf
    • http://nibuxar.saasdssummerprograms.com/uploads/1/3/0/8/130874330/foxavagos-bojuwelege-juzebodut-nubowar.pdf
    • http://laxur.northbranchwoodworking.com/uploads/1/3/2/6/132680937/lunur-tokutitegetoje-latabetumake-merodi.pdf
    • http://files.ipray4u-intl.org/uploads/1/3/1/6/131606057/298567.pdf
    • http://files.emeliewaldken.net/uploads/1/3/1/8/131871488/korazabikopamugo.pdf
    • http://minemugez.tanimaherphotographs.com/uploads/1/3/1/6/131606968/19eaf6bc9e.pdf
    • http://nurojegi.rana-tarabishi.com/uploads/1/3/0/8/130814328/7a21bf77.pdf
    • http://pawak.menasgerovei.lt/uploads/1/3/0/8/130813821/3735515.pdf
    • https://cdn.shopify.com/s/files/1/0434/4204/5090/files/batawuj.pdf
    • https://cdn.shopify.com/s/files/1/0437/1460/9305/files/walafokobus.pdf
    • https://cdn.shopify.com/s/files/1/0479/2906/5639/files/oracle_pl_sql_programming.pdf
    • https://cdn.shopify.com/s/files/1/0478/2447/0175/files/icd_9_code_for_exercise_intolerance.pdf
    • https://uploads.strikinglycdn.com/files/7098edf0-f88f-43ad-97c4-c265fbbec595/56474105662.pdf
    • https://uploads.strikinglycdn.com/files/630fb605-3e56-44ef-85bb-4e0cc22023d9/43169357972.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_off00006264.bin
81a72a0ad68b26f2a92bd57c2e194a796953c6c01bed45d92af79d34fe84f912		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6264 5484 bytes
font_01_sfnt_off0000751b.bin
5eabdec5abf963f55491c9474cf16cd30ff36526a667a3bc2cbd7dd4a3c2300d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x751B 10088 bytes

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