PDF malware analysis — malicious · c323be2e1663f95f

MALICIOUS

PDF

227.8 KB Created: 2021-07-06 02:51:15 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-01

MD5: 8132341064e331edd7e1242e9c8bc044 SHA-1: a8cf6749aa5ee8c062c88c6e57e0e91bbdec0aa9 SHA-256: c323be2e1663f95f6e1343049abc1ab0a8d801c12df9c22460ab21e9dce9223e

192 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious. It uses a fake browser/software-install lure, a callback-phone (TOAD) lure and a fake-CAPTCHA lure. The file routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

Nyx PDF Classifier clean score 0.0118

Heuristics 8

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
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
Callback phishing phone lure medium SE_CALLBACK_LURE

Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
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 http://netcdn.tw/app/1094591345/pokemon-go-free-apk-download-game-hack PDF link annotation
- https://elearning.madhpku.com/__statics/gudangsoal/files/free-roblox-hack_GM431946152.pdfIn PDF document text
- https://elearning.madhpku.com/__statics/gudangsoal/files/minecraft-free-ios-2021_GM479516143.pdfIn PDF document text
- https://elearning.madhpku.com/__statics/gudangsoal/files/coin-master-cheats-free-spins_GM406889139.pdfIn PDF document text
- https://elearning.madhpku.com/__statics/gudangsoal/files/how-to-get-free-robux-without-any-verification_GM431946152.pdfIn PDF document text
- https://elearning.madhpku.com/__statics/gudangsoal/files/coin-master-free-coins-cheat_GM406889139.pdfIn PDF document text
- https://elearning.madhpku.com/__statics/gudangsoal/files/coin-master-free-spin-and-trading-group_GM406889139.pdfIn PDF document text
- https://elearning.madhpku.com/__statics/gudangsoal/files/how-to-make-free-robux_GM431946152.pdfIn PDF document text
- https://elearning.madhpku.com/__statics/gudangsoal/files/how-to-hack-someone-on-roblox_GM431946152.pdfIn PDF document text
- https://elearning.madhpku.com/__statics/gudangsoal/files/how-to-hack-roblox-accounts-on-phone_GM431946152.pdfIn PDF document text
- https://elearning.madhpku.com/__statics/gudangsoal/files/100-hack-coin-master_GM406889139.pdfIn PDF document text
- https://elearning.madhpku.com/__statics/gudangsoal/files/master-coin-free-spin-daily_GM406889139.pdfIn PDF document text
- https://elearning.madhpku.com/__statics/gudangsoal/files/2021-robux-hack_GM431946152.pdfIn PDF document text
- https://elearning.madhpku.com/__statics/gudangsoal/files/how-to-get-free-robux-on-iphone_GM431946152.pdfIn PDF document text
- https://elearning.madhpku.com/__statics/gudangsoal/files/robux-matchcomfree-robux_GM431946152.pdfIn PDF document text
- https://elearning.madhpku.com/__statics/gudangsoal/files/bandit-free-roblox_GM431946152.pdfIn PDF document text
- https://elearning.madhpku.com/__statics/gudangsoal/files/80-free-spins-coin-master_GM406889139.pdfIn PDF document text
- https://elearning.madhpku.com/__statics/gudangsoal/files/earnrobux_GM431946152.pdfIn PDF document text
- https://elearning.madhpku.com/__statics/gudangsoal/files/free-robux-only-1-step_GM431946152.pdfIn PDF document text
- https://elearning.madhpku.com/__statics/gudangsoal/files/minecraft-pe-free-download-android_GM479516143.pdfIn PDF document text
- https://elearning.madhpku.com/__statics/gudangsoal/files/roblox-song-id-young-wild-and-free_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.

Filename	Kind	Source	Size
`stream_023_off000321fa.bin`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x321FA	25576 bytes
SHA-256: `3cff9e48561de6fcffeddc0e164084d55f906850cc0ede53dd18038aa9a2d83a`
`font_01_sfnt_off00035dfc.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x35DFC	19112 bytes
SHA-256: `f66fd6416b157111d5ba2db460c99e058161a497744776245c7bb8760b92a4f8`

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