Malicious PDF — malware analysis report

Static analysis result for SHA-256 f71d033124f3abef…

MALICIOUS

PDF

226.7 KB Created: 2021-07-06 01:28:54 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-16
MD5: cdb460ba4aa9ca2c2de49a8a268ceae9 SHA-1: bf3114c70de4cfc727e014c051d23b53b2ceb435 SHA-256: f71d033124f3abef449e93c827ee501a9cf53c459239ddb608f5141781a1b8a2
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 social engineering lures. Specifically, it uses a fake CAPTCHA and a 'free generator/game hack' lure to trick users into clicking malicious links. The document also contains a browser extension installation lure, suggesting an attempt to install potentially unwanted or malicious software. The primary malicious URL identified is http://netcdn.tw/app/1094591345/is-pokemon-free-game-hack.

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/is-pokemon-free-game-hack In PDF document text
    • http://pustaka.stikesperintis.ac.id/repository/free-roblox-level-7-script-executor_GM431946152.pdfIn PDF document text
    • http://pustaka.stikesperintis.ac.id/repository/roblox-sexually-abused_GM431946152.pdfIn PDF document text
    • http://pustaka.stikesperintis.ac.id/repository/coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://pustaka.stikesperintis.ac.id/repository/how-to-get-free-coins-on-flip-master_GM406889139.pdfIn PDF document text
    • http://pustaka.stikesperintis.ac.id/repository/free-spin-card-exchange-coin-master_GM406889139.pdfIn PDF document text
    • http://pustaka.stikesperintis.ac.id/repository/free-minecraft-coins_GM479516143.pdfIn PDF document text
    • http://pustaka.stikesperintis.ac.id/repository/get-free-robux-gg_GM431946152.pdfIn PDF document text
    • http://pustaka.stikesperintis.ac.id/repository/account-stealing-hack-roblox-2021_GM431946152.pdfIn PDF document text
    • http://pustaka.stikesperintis.ac.id/repository/hacking-a-roblox-hotel-troll-banned_GM431946152.pdfIn PDF document text
    • http://pustaka.stikesperintis.ac.id/repository/free-role-in-coin-master_GM406889139.pdfIn PDF document text
    • http://pustaka.stikesperintis.ac.id/repository/roblox-mm2-cheat-table_GM431946152.pdfIn PDF document text
    • http://pustaka.stikesperintis.ac.id/repository/blogspot-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://pustaka.stikesperintis.ac.id/repository/coin-master-free-spins-only_GM406889139.pdfIn PDF document text
    • http://pustaka.stikesperintis.ac.id/repository/free-robux-with-no-human-verification_GM431946152.pdfIn PDF document text
    • http://pustaka.stikesperintis.ac.id/repository/get-robux-today_GM431946152.pdfIn PDF document text
    • http://pustaka.stikesperintis.ac.id/repository/freespinandcoin-blogspot-coin-master_GM406889139.pdfIn PDF document text
    • http://pustaka.stikesperintis.ac.id/repository/earn-free-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://pustaka.stikesperintis.ac.id/repository/download-coin-master-apk-hack_GM406889139.pdfIn PDF document text
    • http://pustaka.stikesperintis.ac.id/repository/likes-for-tiktok-free_GM835599320.pdfIn PDF document text
    • http://pustaka.stikesperintis.ac.id/repository/can-i-get-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_off00032047.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x32047 25576 bytes
SHA-256: 02ab3051f999686703afef6c93df7b6ab4aba3406f3bf567fec3789b40f47acc
font_01_sfnt_off00035c57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x35C57 18360 bytes
SHA-256: a7a4931e7a22050358f3f72b95ed196e7af8b48c3a3345247e30e3adba163969

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