Malicious PDF — malware analysis report

Static analysis result for SHA-256 83d610cb2c6e4703…

MALICIOUS

PDF

33.8 KB Created: 2021-07-06 01:33:49 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-20
MD5: d14f8547b0d5312dafa10f1ef87045f6 SHA-1: 0190d07d31e166e214e373b6485efce3f5b302c4 SHA-256: 83d610cb2c6e4703a8c955c3c916ef7f24407c914f8fb625b781f3acd68c476b
160 Risk Score

Malware Insights

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

The PDF document contains multiple links that redirect to malicious infrastructure, masquerading as game hacks and generators. The primary lure URL is http://netcdn.tw/app/479516143/best-free-minecraft-skins-game-hack. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to trick users into downloading further malicious content or visiting compromised sites, likely as part of a phishing campaign.

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/479516143/best-free-minecraft-skins-game-hack In PDF document text
    • http://pustaka.minangkabau.unand.ac.id/repository/mad-city-roblox-hack-download_GM431946152.pdfIn PDF document text
    • http://pustaka.minangkabau.unand.ac.id/repository/free-robux-giveaway-live_GM431946152.pdfIn PDF document text
    • http://pustaka.minangkabau.unand.ac.id/repository/get-robux-free-codes_GM431946152.pdfIn PDF document text
    • http://pustaka.minangkabau.unand.ac.id/repository/ways-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://pustaka.minangkabau.unand.ac.id/repository/free-spins-for-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://pustaka.minangkabau.unand.ac.id/repository/how-to-get-free-roblox-items_GM431946152.pdfIn PDF document text
    • http://pustaka.minangkabau.unand.ac.id/repository/coin-master-free-spins-2021-today_GM406889139.pdfIn PDF document text
    • http://pustaka.minangkabau.unand.ac.id/repository/free-roblox-generator-no-verification_GM431946152.pdfIn PDF document text
    • http://pustaka.minangkabau.unand.ac.id/repository/promo-code-free-robux_GM431946152.pdfIn PDF document text
    • http://pustaka.minangkabau.unand.ac.id/repository/coin-master-gameplay_GM406889139.pdfIn PDF document text
    • http://pustaka.minangkabau.unand.ac.id/repository/coin-master-online-hack-no-human-verification_GM406889139.pdfIn PDF document text
    • http://pustaka.minangkabau.unand.ac.id/repository/wurst-minecraft_GM479516143.pdfIn PDF document text
    • http://pustaka.minangkabau.unand.ac.id/repository/roblox-prison-life-hack_GM431946152.pdfIn PDF document text
    • http://pustaka.minangkabau.unand.ac.id/repository/robux-premium_GM431946152.pdfIn PDF document text
    • http://pustaka.minangkabau.unand.ac.id/repository/free-roblox-cards-no-verification_GM431946152.pdfIn PDF document text
    • http://pustaka.minangkabau.unand.ac.id/repository/free-robux-kid-friendly-no-human-verification_GM431946152.pdfIn PDF document text
    • http://pustaka.minangkabau.unand.ac.id/repository/minecraft-free-download-iphone_GM479516143.pdfIn PDF document text
    • http://pustaka.minangkabau.unand.ac.id/repository/coin-master-apk-hack-mod-download_GM406889139.pdfIn PDF document text
    • http://pustaka.minangkabau.unand.ac.id/repository/chara-undertale-lua-for-nonsense-diamond-roblox-hack_GM431946152.pdfIn PDF document text
    • http://pustaka.minangkabau.unand.ac.id/repository/free-robux-2021_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_off00003073.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3073 22128 bytes
SHA-256: ac2ebb4d6e48f415568fdf684deb8ff461a27aa11e14acc3eb82232e411a893c
font_01_sfnt_off00006169.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6169 18244 bytes
SHA-256: 18712d60a953fc3fe86cc83c95b3ca3d74ed70e84abc18f4745dfc47eeaf269f

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