Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a31167c918617a8…

MALICIOUS

PDF

226.6 KB Created: 2021-07-04 23:48:52 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 3ea7228a627f1cac0cc6244d75a67db8 SHA-1: 48228531788daf1854ff879e0040788aa5a5bf1d SHA-256: 9a31167c918617a889732a8fad63d87def87b01085ac854fbccf6d7e9c00139b
250 Risk Score

Malware Insights

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

The PDF document contains multiple lures, including a fake CAPTCHA and a "free generator / game hack" theme, designed to trick users into clicking malicious links. The primary link, http://netcdn.tw/app/1094591345/pokemon-go-free-stardust-game-hack, is identified as a malicious redirector. The document also prompts users to install browser extensions or updates, a common social engineering tactic for malware delivery.

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/pokemon-go-free-stardust-game-hack In PDF document text
    • http://www.elibrary.perludem.org/repository/free-minecraft-mods_GM479516143.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/coin-master-hacks-for-cards_GM406889139.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/how-to-easily-get-free-robux_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/roblox-hacks-2021-augest-7th_GM431946152.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/huskybuckscom-free-robux_GM431946152.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/free-robux-glitch-5milion-robux-october-2021_GM431946152.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/free-dominus-roblox-hack_GM431946152.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/how-to-hack-roblox-cheat-engine-67_GM431946152.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/zombie-rush-hack-roblox_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org//repository/websites-for-robux_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/free-robux-injector_GM431946152.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/free-robux-generator-no-survey-or-download-2021_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/best-free-roblox-exploit-2021_GM431946152.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/60-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/cheat-codes-on-roblox-xbox-one_GM431946152.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/fb-coin-master-free-spins-link_GM406889139.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/hacked-roblox-accountsd_GM431946152.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/free-robux-no-verify-2021_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/casini-free-robux_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/list-of-roblox-hackers_GM431946152.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_023_off00031e95.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x31E95 25576 bytes
SHA-256: 514f08d6920ef8928bffb1b1300cd16a977dd232468bd05ea569c35f619abe37
font_01_sfnt_off00035a98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x35A98 18776 bytes
SHA-256: 8dd74b7e760d3cf270763d12a927e7bd05597f59885d465d566922ba01eafede

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