Malicious PDF — malware analysis report

Static analysis result for SHA-256 11837a15b401a90c…

MALICIOUS

PDF

45.8 KB Created: 2021-06-11 06:41:33 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: b674b45039e8decf783b18af9bdf426c SHA-1: d123a811ff014fdaf0de8a7c3dc6df67862d24dd SHA-256: 11837a15b401a90ceb57af2bde6d7087613ec59b2fd912016f6a39f5291c4136
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. It uses a callback-phone (TOAD) lure. The file routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

Heuristics 5

  • PDF links to a 'free generator / game hack' redirector high 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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/how-to-get-free-robux-really-works-easy-game-hack PDF link annotation
    • https://lib.bunghatta.ac.id/app/repository/how-to-get-free-robux-hack-2021_GM431946152.pdfIn PDF document text
    • https://lib.bunghatta.ac.id/app/repository/roblox-source_GM431946152.pdfIn PDF document text
    • https://lib.bunghatta.ac.id/app/repository/innovation-hack-roblox_GM431946152.pdfIn PDF document text
    • https://lib.bunghatta.ac.id/app/repository/pubg-uc-account_GM1330123889.pdfIn PDF document text
    • https://lib.bunghatta.ac.id/app/repository/free-minecraft-server-hosting_GM479516143.pdfIn PDF document text
    • https://lib.bunghatta.ac.id/app/repository/im-being-called-a-hacker-on-roblox_GM431946152.pdfIn PDF document text
    • https://lib.bunghatta.ac.id/app/repository/can-you-make-a-minecraft-server-for-free_GM479516143.pdfIn PDF document text
    • https://lib.bunghatta.ac.id/app/repository/minecraft-coins-free_GM479516143.pdfIn PDF document text
    • https://lib.bunghatta.ac.id/app/repository/tiktok-likes-free_GM835599320.pdfIn PDF document text
    • https://lib.bunghatta.ac.id/app/repository/free-coins-coin-master-blog_GM406889139.pdfIn PDF document text
    • https://lib.bunghatta.ac.id/app/repository/coin-master-tips_GM406889139.pdfIn PDF document text
    • https://lib.bunghatta.ac.id/app/repository/roblox-hacks-2021_GM431946152.pdfIn PDF document text
    • https://lib.bunghatta.ac.id/app/repository/roblox-ro-ghoul-free-vip-server_GM431946152.pdfIn PDF document text
    • https://lib.bunghatta.ac.id/app/repository/robux-for-surveys_GM431946152.pdfIn PDF document text
    • https://lib.bunghatta.ac.id/app/repository/coin-master-for-pc-free-download_GM406889139.pdfIn PDF document text
    • https://lib.bunghatta.ac.id/app/repository/hacker-egg-2021-roblox_GM431946152.pdfIn PDF document text
    • https://lib.bunghatta.ac.id/app/repository/minecraft-auto-miner-hack_GM479516143.pdfIn PDF document text
    • https://lib.bunghatta.ac.id/app/repository/piano-keybard-roblox-hack_GM431946152.pdfIn PDF document text
    • https://lib.bunghatta.ac.id/app/repository/minecraft-online-free-download_GM479516143.pdfIn PDF document text
    • https://lib.bunghatta.ac.id/app/repository/minecraft-hacks-pc_GM479516143.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00004f8d.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4F8D 27088 bytes
SHA-256: a29d55dcf66cd4f0bc7190d235f23851e2f9216294c83079671d1182d0c784d9
font_01_sfnt_off00008def.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8DEF 19132 bytes
SHA-256: d0cf31ad5f5e349e4bd92f6115501a32f4136d9de877c9cfe21dfc27d59d8b59

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