Malicious PDF — malware analysis report

Static analysis result for SHA-256 24b2b89c522fb472…

MALICIOUS

PDF

34.3 KB Created: 2021-06-29 15:53:19 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 4b9fe9f41d295cd7107c86954e48d161 SHA-1: 85ccac1f70f39c25a3429e300f2819b9fc8ade9a SHA-256: 24b2b89c522fb4722041b4d41745eff1ee373c6e5cf0be53c896832d804322a4
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains multiple links to malicious redirectors, masquerading as generators for in-game currency or game hacks. The primary lure is 'Get Free Obc On Roblox' pointing to http://netcdn.co/app/431946152/get-free-obc-on-roblox-game-hack, which is flagged as a malicious redirector. The document's structure and embedded URLs strongly suggest a phishing or scam campaign designed to lead users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 4

  • PDF links to a 'free generator / game hack' redirector critical PDF_GAME_HACK_REDIRECT_LURE
    PDF's clickable action targets a redirector of the form /app/<id>/<slug>-game-hack — the landing-page shape of a large SEO 'free spins / generator / game hack' lure family that funnels victims through rotating disposable hosts to a malware/scam payload. The multi-link variants also trip ML/link-farm rules; this catches the single-link variants that otherwise score clean. CRITICAL on its own: the /app/<id>/<slug>-game-hack path shape is unambiguous scam infra, and the host rotates so a host-list match can't be relied on.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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 http://netcdn.co/app/431946152/get-free-obc-on-roblox-game-hack In PDF document text
    • http://elibrary.smknesbu.sch.id/repository/free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/how-to-cheat-in-roblox-with-scriptss_GM431946152.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/robux-free-co_GM431946152.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/freerobuxgenerator-trackid-sp006_GM431946152.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/best-hacked-client_GM479516143.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/how-to-get-free-robux-without-doing-anything_GM431946152.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/roblox-birthday-banner-free_GM431946152.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/coin-master-free-stuff_GM406889139.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/coin-master-free-spins-and-coins-blogspot_GM406889139.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/roblox-tuto-robux-no-hack_GM431946152.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/how-to-get-free-robux-on-roblox-by-playing-games_GM431946152.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/free-funny-roblox-shirt_GM431946152.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/hacks-para-roblox-dragon-ball-rage_GM431946152.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/dragon-keeper-roblox-cheats_GM431946152.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/coin-master-free-spins-2021-no-human-verification_GM406889139.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/tiktok-free-view-iphone-apps_GM835599320.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/free-roblox-accouts-that-work_GM431946152.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/can-you-hack-someone-roblox_GM431946152.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/free-robux-com_GM431946152.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/hackear-roblox-para-android_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off00002f72.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2F72 22556 bytes
SHA-256: 1329a329895fddabbee1a9c16ab968d5fff0ee22a71f27d73bbae7789139818e
font_01_sfnt_off000061a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x61A0 18752 bytes
SHA-256: 8fef05c6ad26167d3e55218676aad54b274b82e39ef0c320ba47d1d911f889da

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