Malicious PDF — malware analysis report

Static analysis result for SHA-256 8232bfb6c6e914b9…

MALICIOUS

PDF

50.7 KB Created: 2021-06-07 18:27:46 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-23
MD5: f4ef6cd0e3bb0ec03b76fada49569cbc SHA-1: c70a1d7141cdfad0390cfdb70fc3c1d25513be54 SHA-256: 8232bfb6c6e914b9e387144e29e74546eed618b0d656d2fe1fb5597ea123b5b7
160 Risk Score

Malware Insights

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

This PDF document contains multiple links to known malicious redirectors and lures users with promises of game hacks and free generators. The embedded URL 'https://netcdn.tw/app/431946152/free-roblox-code-generator-no-download-game-hack' is a primary indicator of this malicious intent. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it's designed to exploit user curiosity and lead them to potentially harmful content or downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9681

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 https://netcdn.tw/app/431946152/free-roblox-code-generator-no-download-game-hack In PDF document text
    • http://heilzentrum-ulm.de/images/coinmaster-gps-user-review-coinmaster-coin-master-hack-pagedemo-index_GM406889139.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/free-spins-coin-master-app_GM406889139.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/coin-master-online-hack-no-human-verification_GM406889139.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/coin-master-hack-xyz_GM406889139.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/free-robux-without-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/hack-xp-net-generators-coin-master_GM406889139.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/how-to-hack-a-minecraft-server_GM479516143.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/how-to-get-free-robux-youtube_GM431946152.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/minecraft-mac-free_GM479516143.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/roblox-troll-outfits-free_GM431946152.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/roblox-free-trade-bot_GM431946152.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/pubg-74-uc_GM1330123889.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/gift-free-robux_GM431946152.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/get-coin-master-free-spin_GM406889139.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/adopt-me-roblox-money-hacks_GM431946152.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/daily-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/free-tiktok-accounts_GM835599320.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/all-of-the-free-roblox-clothes_GM431946152.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/robux-matchcomfree-robux_GM431946152.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/roblox-sued_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00005001.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5001 24796 bytes
SHA-256: dec083c5ea9bc6b0bb1dff39736660f440f8497d75305f2b9787044bd505f46e
font_01_sfnt_off0000894f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x894F 3992 bytes
SHA-256: 43e72e756231cfd354bd65c2ed3b09ad4eff56ad11e7f155ed2920e6bb7860dd
font_02_sfnt_off0000966b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x966B 3120 bytes
SHA-256: 49734f51977507cba6bc8d3ad0cee0363aa119856db094427deb9cf565bb7bca
font_03_sfnt_off0000a17f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA17F 18788 bytes
SHA-256: 26832f33eda7cdc1b4d1851c2d39f5ad8609da1d994eb1f7cc45bcb39d34a005

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