Malicious PDF — malware analysis report

Static analysis result for SHA-256 098a9fd823d53c8d…

MALICIOUS

PDF

225.8 KB Created: 2021-07-08 01:43:28 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-27
MD5: ef007d9fe096461ef487951797941134 SHA-1: cb001d6d4e4e8396d0098a72a0eee7b75656d814 SHA-256: 098a9fd823d53c8d28be7bccdd1d2d3ab40233afcdb6a8b7be92ddd8989abc07
250 Risk Score

Malware Insights

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

The PDF file contains multiple heuristics indicating malicious redirection and social engineering lures, specifically a fake CAPTCHA and a browser extension installation prompt. The primary URL identified, http://netcdn.tw/app/1094591345/pokeballs-pokemon-go-free-game-hack, is flagged as a known malicious redirector. The document body, though heavily obfuscated, contains references to game hacks and generators, aligning with the redirection lure.

Machine Learning

  • Nyx PDF Classifier clean score 0.0118

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/pokeballs-pokemon-go-free-game-hack In PDF document text
    • http://elibrary.perludem.org//repository/coin-master-2021_GM406889139.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/roblox-hack-for-life-in-psridise_GM431946152.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/roblox-hacked-smile_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/how-to-get-free-clothes-in-roblox-without-robux_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/free-robux-com-no-verification_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/today-free-robux_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org//repository/robux-hack-me_GM431946152.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/free-robux-no-human-verification-no-surveys_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/coin-master-heaven-free-spins-today_GM406889139.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/robux-free-gift-card-org-hack_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/card-hack-in-coin-master_GM406889139.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/free-toy-codes-for-roblox_GM431946152.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/coin-master-15-free-spin-link-of-last-5-days_GM406889139.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/how-to-get-a-free-promo-code-roblox_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/roblox-free-robux-inspect-element-2021_GM431946152.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/roblox-hack-exploit-project-pokemon_GM431946152.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/roblox-speed-hack-2021-may_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/free-robux-gen_GM431946152.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/roblox-hack-com_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/free-builders-club-accounts-on-roblox_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_off00031bf8.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x31BF8 25576 bytes
SHA-256: 4654165dbdf63e940da3af6591ea123b66d5491f924f1ca9c8106801c6688270
font_01_sfnt_off00035804.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x35804 18592 bytes
SHA-256: 2b18aef9e83197765df1c169fc6955ce80a9dcab18ea641bb48f6bdc3c7fbd00

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