Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf5b2ac3e3e12950…

MALICIOUS

PDF

33.8 KB Created: 2021-07-04 14:46:37 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-27
MD5: efb00a6c0a0f31ce2b967f8e14821d35 SHA-1: e1015c4f69e4a6dd7e08d506808c5b6583acec97 SHA-256: bf5b2ac3e3e1295074c3decf61e2fdfbbfe408812b008a1f08b77902c84ec710
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a malicious redirector link disguised as a game hack generator, aiming to lure users to a compromised website. The ML classifier strongly indicated maliciousness, and the presence of a download button lure further supports a malicious intent. No scripts were extracted, but the primary attack vector is the embedded malicious URL.

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.tw/app/431946152/free-arsenal-hacks-game-hack In PDF document text
    • https://library.sman1berau.sch.id/repository/coin-master-fun-hack_GM406889139.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/earn-free-robux_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/how-do-you-get-free-roblox_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/freerobuxhack-us-2021_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/roblox-hackeado-con-robux-infinitos_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/coin-master-computer-hack_GM406889139.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/ho-to-make-a-shirt-in-roblox-2021-for-free_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/coin-master-free-cards-link-2021_GM406889139.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/coin-master-50-spin-link_GM406889139.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/coin-master-free-spins-2021-generator_GM406889139.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/rbx-space-free-robux_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/free-minecraft-worlds_GM479516143.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/what-is-robux_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/robloxmatchcom-free-robux_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/free-hair-roblox-boy_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/free-coin-master-hack-no-verification_GM406889139.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/game-hunters-coin-master_GM406889139.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/are-there-any-coin-master-hacks-that-actually-work_GM406889139.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/free-robux-real-2021_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/hack-coin-master-using-cheat-engine_GM406889139.pdfIn PDF document text
    • https://www.roblox.com/my/tasksIn 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
font_00_sfnt_off00003098.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3098 22088 bytes
SHA-256: 23e61adb7bfab716aa70f830a4f4f120166e8777c119f69d44719eb276cfce96
font_01_sfnt_off0000617b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x617B 18312 bytes
SHA-256: f9607999b0a83cf7917a054952f67b932e8d7c28bffbab17ec20fe126e5daa79

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