PDF malware analysis — malicious · b3e82ea5e5d617d2

MALICIOUS

PDF

48.0 KB Created: 2021-06-10 14:20:33 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-11

MD5: 7c1e3a6ebec892d0382dc1859e565b9d SHA-1: e4ddf85f60f8ea40c45e05b10d7ffac5c3703fe5 SHA-256: b3e82ea5e5d617d2d136f2fc8011e6cdd8fa95839a8adcad5459dce4d6e15135

200 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains multiple links to known malicious redirectors, disguised as 'game hacks' and 'free generators'. The presence of a fake CAPTCHA heuristic indicates an attempt to trick the user into interacting with these links. The primary URL, https://netcdn.tw/app/431946152/case-clicker-hack-roblox-2021-game-hack, is a key indicator of the malicious redirection chain. No scripts were extracted, but the document structure and heuristics strongly suggest a phishing or malware distribution lure.

Machine Learning

Nyx PDF Classifier malicious score 0.9796

Heuristics 5

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
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 https://netcdn.tw/app/431946152/case-clicker-hack-roblox-2021-game-hack In PDF document text
- https://elearning.mariyadl.sch.id/__statics/gudangsoal/files/how-to-get-free-robux-on-mobile_GM431946152.pdfIn PDF document text
- https://elearning.mariyadl.sch.id/__statics/gudangsoal/files/coin-master-today_GM406889139.pdfIn PDF document text
- https://elearning.mariyadl.sch.id/__statics/gudangsoal/files/free-coloring-activity-pages-roblox_GM431946152.pdfIn PDF document text
- https://elearning.mariyadl.sch.id/__statics/gudangsoal/files/best-free-minecraft-hacked-client_GM479516143.pdfIn PDF document text
- https://elearning.mariyadl.sch.id/__statics/gudangsoal/files/roblox-land-free-robux_GM431946152.pdfIn PDF document text
- https://elearning.mariyadl.sch.id/__statics/gudangsoal/files/can-you-give-me-robux_GM431946152.pdfIn PDF document text
- https://elearning.mariyadl.sch.id/__statics/gudangsoal/files/coin-master-vip-hack_GM406889139.pdfIn PDF document text
- https://elearning.mariyadl.sch.id/__statics/gudangsoal/files/free-minecraft-worlds_GM479516143.pdfIn PDF document text
- https://elearning.mariyadl.sch.id/__statics/gudangsoal/files/minecraft-free-download-android-apk_GM479516143.pdfIn PDF document text
- https://elearning.mariyadl.sch.id/__statics/gudangsoal/files/free-roblox-accounts-2021-with-robux_GM431946152.pdfIn PDF document text
- https://elearning.mariyadl.sch.id/__statics/gudangsoal/files/coin-master-free-spins-android_GM406889139.pdfIn PDF document text
- https://elearning.mariyadl.sch.id/__statics/gudangsoal/files/free-robux-that-actually-works-2021_GM431946152.pdfIn PDF document text
- https://elearning.mariyadl.sch.id/__statics/gudangsoal/files/martian-lettuce-coin-master-free_GM406889139.pdfIn PDF document text
- https://elearning.mariyadl.sch.id/__statics/gudangsoal/files/roblox-comment-cheat_GM431946152.pdfIn PDF document text
- https://elearning.mariyadl.sch.id/__statics/gudangsoal/files/coin-master-gift-link-hack_GM406889139.pdfIn PDF document text
- https://elearning.mariyadl.sch.id/__statics/gudangsoal/files/coin-master-hack-2021_GM406889139.pdfIn PDF document text
- https://elearning.mariyadl.sch.id/__statics/gudangsoal/files/coin-master-hack-spins-game-download_GM406889139.pdfIn PDF document text
- https://elearning.mariyadl.sch.id/__statics/gudangsoal/files/roblox-prison-life-hack_GM431946152.pdfIn PDF document text
- https://elearning.mariyadl.sch.id/__statics/gudangsoal/files/coin-master-daily-free-spins-and-coins_GM406889139.pdfIn PDF document text
- https://elearning.mariyadl.sch.id/__statics/gudangsoal/files/roblox-hack-codes_GM431946152.pdfIn PDF document text
- http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`stream_004_off0000522a.bin`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x522A	25504 bytes
SHA-256: `8d681786541c6e0641a6a75553b1384b005dce50883c447ab93303f12d827084`
`font_01_sfnt_off00008d57.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x8D57	2940 bytes
SHA-256: `eb230542719c96b42e3fd8bb01e35f13ebd5f02629049da3a58e7fd7607bf48a`
`font_02_sfnt_off00009766.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x9766	18704 bytes
SHA-256: `3b350a8b66f4536d608c2b4c0689ae44eb54bda6e0b277fb31302be3affc05b6`

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