PDF malware analysis — malicious · d54dc0f006ef9d89

MALICIOUS

PDF

46.2 KB Created: 2021-06-03 12:31:13 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-07

MD5: d2401696bc73933bfd8fad31c16e1b94 SHA-1: 886d2ac6c2ea5d178533a6531dc6880c838d3be8 SHA-256: d54dc0f006ef9d89d384c5318e7fbda439769b22e293f8c125f7db0ec3b3a9a6

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. It also displays a fake CAPTCHA prompt to trick users into interacting with the malicious content. The ML classifier strongly flagged this PDF as malicious, indicating a high likelihood of a malicious workflow. No scripts were extracted, but the embedded URLs and the fake CAPTCHA lure are strong indicators of a phishing or scam attempt.

Machine Learning

Nyx PDF Classifier malicious score 0.9797

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.online/app/431946152/earn-robux-game-hack In PDF document text
- https://www.insol-europe.org/uploads/files/files/real-robux-generator-2021_GM431946152.pdfIn PDF document text
- https://www.insol-europe.org/uploads/files/files/free-spins-from-coin-master_GM406889139.pdfIn PDF document text
- https://www.insol-europe.org/uploads/files/files/can-you-still-get-minecraft-windows-10-for-free_GM479516143.pdfIn PDF document text
- https://www.insol-europe.org/uploads/files/files/coin-master-hack-spins_GM406889139.pdfIn PDF document text
- https://www.insol-europe.org/uploads/files/files/coin-master-links-for-free-spins-2021_GM406889139.pdfIn PDF document text
- https://www.insol-europe.org/uploads/files/files/roblox-avatar-girl_GM431946152.pdfIn PDF document text
- https://www.insol-europe.org/uploads/files/files/coin-master-daily-free-spins-link-app_GM406889139.pdfIn PDF document text
- https://www.insol-europe.org/uploads/files/files/free-spin-coin_GM406889139.pdfIn PDF document text
- https://www.insol-europe.org/uploads/files/files/tiktok-free-template_GM835599320.pdfIn PDF document text
- https://www.insol-europe.org/uploads/files/files/free-coin-master-spins_GM406889139.pdfIn PDF document text
- https://www.insol-europe.org/uploads/files/files/free-robux-mod_GM431946152.pdfIn PDF document text
- https://www.insol-europe.org/uploads/files/files/minecraft-pe-hack-client_GM479516143.pdfIn PDF document text
- https://www.insol-europe.org/uploads/files/files/free-spin-link_GM406889139.pdfIn PDF document text
- https://www.insol-europe.org/uploads/files/files/free-tiktok-like_GM835599320.pdfIn PDF document text
- https://www.insol-europe.org/uploads/files/files/how-to-get-free-robux-app_GM431946152.pdfIn PDF document text
- https://www.insol-europe.org/uploads/files/files/roblox-hack-unlimited-robux_GM431946152.pdfIn PDF document text
- https://www.insol-europe.org/uploads/files/files/code-free-robux_GM431946152.pdfIn PDF document text
- https://www.insol-europe.org/uploads/files/files/hackear-juego-coin-master-espaol_GM406889139.pdfIn PDF document text
- https://www.insol-europe.org/uploads/files/files/get-2021-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
- https://www.insol-europe.org/uploads/files/files/free-daily-spins-coin-master-2021_GM406889139.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_off000050fa.bin`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x50FA	24604 bytes
SHA-256: `620cb84f1c2135da934b0e1b0c9e9e79de7bb1908cff76a73f12a7fd8f27fe2c`
`font_01_sfnt_off000088b1.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x88B1	2824 bytes
SHA-256: `45bf821f81e84f4aa8d8374f492b182b36404f38b462c7dc471deaad6ab5c104`
`font_02_sfnt_off0000925e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x925E	18076 bytes
SHA-256: `211a529ae6a0212354e2c8faa3e6424c15162b595112409e99389753daabd842`

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