Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc4bed48156779e6…

MALICIOUS

PDF

226.9 KB Created: 2021-07-05 14:37:33 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-25
MD5: c29e75384df8310b56b2e33152e8d2c6 SHA-1: 486d04c3642d477e4c38e7e765130cb922ac1560 SHA-256: fc4bed48156779e687ae22cb4381d1d2c9472ac49bf6ebf0a7917affb7f05d9d
250 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains multiple high-severity heuristics indicating malicious intent, including lures for game hacks, fake CAPTCHAs, and browser extension installations. The primary embedded URL, http://netcdn.tw/app/1094591345/how-to-get-coins-on-pokemon-go-free-game-hack, is identified as a malicious redirector. The document body, though heavily obfuscated, contains references to the lure and the malicious URL, reinforcing the social engineering aspect.

Machine Learning

  • Nyx PDF Classifier clean score 0.0117

Heuristics 7

  • 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.
  • 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
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise pattern
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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/1094591345/how-to-get-coins-on-pokemon-go-free-game-hack In PDF document text
    • http://library.gkigadingserpong.org/repository/free-robux-com-2021_GM431946152.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/how-do-i-hack-roblox-free-robux_GM431946152.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/how-to-get-free-robux-and-tix-no-hack_GM431946152.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/minecraft-free-apk_GM479516143.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/how-to-setup-a-minecraft-server-for-free_GM479516143.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/free-logo-roblox_GM431946152.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/hack-on-roblox-free-robux_GM431946152.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/infinity-rpg-roblox-cheat_GM431946152.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/pubg-uc-hack-without-human-verification_GM1330123889.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/coin-master-how-to-get-free-pet-food_GM406889139.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/mosttechs-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/legit-coin-master-hack-october-2021_GM406889139.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/hacks-roblox-royal-jelly_GM431946152.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/coin-master-hacks-free-spins_GM406889139.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/roblox-free-play-no-download_GM431946152.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/roblox-games-to-play-for-free_GM431946152.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/roblox-studio-free-robux_GM431946152.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/freecoins_GM406889139.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/free-robux-for-kids-who-cant-do-human-varication_GM431946152.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/how-to-earn-free-robux_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_023_off00031fbd.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x31FBD 25576 bytes
SHA-256: 8d87e85cf820ac1268c79fe01fd873e5b835c75a1ebda136eb684f2733ceeb55
font_01_sfnt_off00035bac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x35BAC 18744 bytes
SHA-256: 5fe1b56b267169561443696038659d824be2aa09efe4421711383fcc2f42e1e5

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