Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b9e31bc5289cc6e…

MALICIOUS

PDF

33.3 KB Created: 2021-07-05 21:55:59 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 678837623ed9edd1d09b68b634ead8fa SHA-1: 9769b56e5d3ece4fc0cc003592358f755e9bb521 SHA-256: 6b9e31bc5289cc6e6bf38a9dbd0584abe361b6e57965fbaa58e5bada106cadfb
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links that redirect to malicious infrastructure, specifically promoting game hacks and generators. The primary malicious URL identified is http://netcdn.tw/app/406889139/reddit-coin-master-free-spins-game-hack. While no scripts were explicitly extracted, the PDF structure and embedded links strongly suggest a social engineering tactic to lure users to potentially malicious sites, likely for malware distribution or phishing.

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/406889139/reddit-coin-master-free-spins-game-hack In PDF document text
    • http://library.asih-husada.ac.id/repository/tower-of-hell-roblox-hack-mobile_GM431946152.pdfIn PDF document text
    • http://library.asih-husada.ac.id/repository/minecraft-java-for-free_GM479516143.pdfIn PDF document text
    • http://library.asih-husada.ac.id/repository/roblox-cheat-xbox-one-argent_GM431946152.pdfIn PDF document text
    • http://library.asih-husada.ac.id/repository/robux-only_GM431946152.pdfIn PDF document text
    • http://library.asih-husada.ac.id/repository/ninja-simulator-roblox-cheats-for-xbox_GM431946152.pdfIn PDF document text
    • http://library.asih-husada.ac.id/repository/coin-master-free-spin-and-coin-link-today_GM406889139.pdfIn PDF document text
    • http://library.asih-husada.ac.id/repository/how-long-of-a-ban-on-roblox-for-hacks_GM431946152.pdfIn PDF document text
    • http://library.asih-husada.ac.id/repository/aimbot-hack-dll-download-roblox_GM431946152.pdfIn PDF document text
    • http://library.asih-husada.ac.id/repository/how-to-hack-roblox-2021_GM431946152.pdfIn PDF document text
    • http://library.asih-husada.ac.id/repository/rbx-free-robux_GM431946152.pdfIn PDF document text
    • http://library.asih-husada.ac.id/repository/coin-master-game-hunter_GM406889139.pdfIn PDF document text
    • http://library.asih-husada.ac.id/repository/discord-free-t-shirts-roblox_GM431946152.pdfIn PDF document text
    • http://library.asih-husada.ac.id/repository/hack-roblox-blob-simulator_GM431946152.pdfIn PDF document text
    • http://library.asih-husada.ac.id/repository/how-to-hack-roblox-using-cheat-engine-64_GM431946152.pdfIn PDF document text
    • http://library.asih-husada.ac.id/repository/hack-roblox-in-prison-life_GM431946152.pdfIn PDF document text
    • http://library.asih-husada.ac.id/repository/rbl-gg-free-robux_GM431946152.pdfIn PDF document text
    • http://library.asih-husada.ac.id/repository/roblox-jailbreak-hack-2021-september_GM431946152.pdfIn PDF document text
    • http://library.asih-husada.ac.id/repository/free-roblox-lua-exploits_GM431946152.pdfIn PDF document text
    • http://library.asih-husada.ac.id/repository/how-to-get-free-robux-on-chromebook_GM431946152.pdfIn PDF document text
    • http://library.asih-husada.ac.id/repository/roblox-mm2-how-to-get-free-coins_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
font_00_sfnt_off00002e2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2E2E 22168 bytes
SHA-256: 9e5c1a0ef26b599f88f89f777087874276bc1807e72db62d5dd009bf2b559de0
font_01_sfnt_off00005f3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5F3E 18348 bytes
SHA-256: 3fe39b2930b076df7c33fd3c1127f420799a62b8c1a063cb4499e2e561575943

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