Malicious PDF — malware analysis report

Static analysis result for SHA-256 0e4b309b7bd103d2…

MALICIOUS

PDF

44.3 KB Created: 2021-06-08 21:18:53 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 0f2537a19acadab74ad900bd0c6bb78b SHA-1: 276a078a04d49effb64a9194df6c57f0fc289c7f SHA-256: 0e4b309b7bd103d25efe6ac706626149a999f23bd4f2a4605ee2c8031f98e72c
122 Risk Score

Malware Insights

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

The PDF contains a high-severity heuristic indicating it's a game hack redirect lure, pointing to a suspicious URL. The document body, though heavily obfuscated, contains references to the same URL and mentions 'wkhtmltopdf', suggesting it was generated by a tool. The fake CAPTCHA heuristic further supports the malicious intent of tricking users into interacting with the lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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.
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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/roblox-hacker-pants-game-hack PDF link annotation
    • http://elearnfactory.com/images/coin-master-free-coins-link-2021-deutsch_GM406889139.pdfIn PDF document text
    • http://elearnfactory.com/images/free-spins-coin-master-haktuts_GM406889139.pdfIn PDF document text
    • http://elearnfactory.com/images/earn-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://elearnfactory.com/images/free-minecraft-skins-pe_GM479516143.pdfIn PDF document text
    • http://elearnfactory.com/images/how-to-get-free-tiktok-followers-without-human-verification_GM835599320.pdfIn PDF document text
    • http://elearnfactory.com/images/coin-master-heaven-daily-free-spins_GM406889139.pdfIn PDF document text
    • http://elearnfactory.com/images/minecraft-java-account-free_GM479516143.pdfIn PDF document text
    • http://elearnfactory.com/images/free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://elearnfactory.com/images/free-minecraft-texture-packs_GM479516143.pdfIn PDF document text
    • http://elearnfactory.com/images/roblox-booga-booga-hack_GM431946152.pdfIn PDF document text
    • http://elearnfactory.com/images/free-views-on-tiktok_GM835599320.pdfIn PDF document text
    • http://elearnfactory.com/images/minecraft-font-free_GM479516143.pdfIn PDF document text
    • http://elearnfactory.com/images/coin-master-free-spins-2021_GM406889139.pdfIn PDF document text
    • http://elearnfactory.com/images/wurst-18_GM479516143.pdfIn PDF document text
    • http://elearnfactory.com/images/free-cod-style-games-roblox_GM431946152.pdfIn PDF document text
    • http://elearnfactory.com/images/fb-coin-master-free-spins-link_GM406889139.pdfIn PDF document text
    • http://elearnfactory.com/images/coin-master-free-spins-deutsch-download-2021-link_GM406889139.pdfIn PDF document text
    • http://elearnfactory.com/images/get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://elearnfactory.com/images/roblox-adidas-free_GM431946152.pdfIn PDF document text
    • http://elearnfactory.com/images/random-free-roblox-account_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
stream_004_off00005100.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5100 24684 bytes
SHA-256: e9956b715b965491e3cf33d3f628d429040bfd267d5c6d6bbbbbe5b2d55934f6
font_01_sfnt_off000089e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x89E4 18440 bytes
SHA-256: 408c9145b9e85311085f996f792dcbf33388db3c43a59690a67d02647e26a71d

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