PDF malware analysis — malicious · 81bda2c3b7da5c0c

MALICIOUS

PDF

44.4 KB Created: 2021-06-09 17:12:02 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-11

MD5: 327b14da1235797da0dd7c9fdea1c354 SHA-1: 94c093fb712ab2a134f3913d1b7b7c12ea4d583a SHA-256: 81bda2c3b7da5c0cb781ae2de0b3d7e369962c1fbff8cabe332f5834f352cbc9

200 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF file contains heuristics indicating it's a lure for game hacks and uses a fake CAPTCHA to trick users. It links to a known malicious redirector infrastructure, which likely serves as a delivery mechanism for a second-stage payload. The document body, though heavily obfuscated, contains references to the malicious URL.

Machine Learning

Nyx PDF Classifier malicious score 0.9865

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/fake-hacker-on-roblox-game-hack In PDF document text
- https://www.misceren.com/home/misceren/public_html/upload/files/coin-master-free-spin-and-coins-links-2021_GM406889139.pdfIn PDF document text
- https://www.misceren.com/home/misceren/public_html/upload/files/roblox-robux-generator_GM431946152.pdfIn PDF document text
- https://www.misceren.com/home/misceren/public_html/upload/files/minecraft-pe-hacks-ios_GM479516143.pdfIn PDF document text
- https://www.misceren.com/home/misceren/public_html/upload/files/free-robux-no-password_GM431946152.pdfIn PDF document text
- https://www.misceren.com/home/misceren/public_html/upload/files/best-free-minecraft-texture-packs_GM479516143.pdfIn PDF document text
- https://www.misceren.com/home/misceren/public_html/upload/files/free-robux-generator-2021_GM431946152.pdfIn PDF document text
- https://www.misceren.com/home/misceren/public_html/upload/files/minecraft-svg-free_GM479516143.pdfIn PDF document text
- https://www.misceren.com/home/misceren/public_html/upload/files/free-minecraft-codes_GM479516143.pdfIn PDF document text
- https://www.misceren.com/home/misceren/public_html/upload/files/hacks-minecraft_GM479516143.pdfIn PDF document text
- https://www.misceren.com/home/misceren/public_html/upload/files/www-rbxhut-com_GM431946152.pdfIn PDF document text
- https://www.misceren.com/home/misceren/public_html/upload/files/codes-how-to-get-free-robux_GM431946152.pdfIn PDF document text
- https://www.misceren.com/home/misceren/public_html/upload/files/roblox-free-robux-hack_GM431946152.pdfIn PDF document text
- https://www.misceren.com/home/misceren/public_html/upload/files/free-coins-coin-master-link_GM406889139.pdfIn PDF document text
- https://www.misceren.com/home/misceren/public_html/upload/files/is-minecraft-java-edition-free_GM479516143.pdfIn PDF document text
- https://www.misceren.com/home/misceren/public_html/upload/files/coin-master-free-soins_GM406889139.pdfIn PDF document text
- https://www.misceren.com/home/misceren/public_html/upload/files/how-to-hack-rpg-games-on-roblox_GM431946152.pdfIn PDF document text
- https://www.misceren.com/home/misceren/public_html/upload/files/coin-master-connection-lost-hack_GM406889139.pdfIn PDF document text
- https://www.misceren.com/home/misceren/public_html/upload/files/free-roblox-accounts-with-robux-that-work-not-banned_GM431946152.pdfIn PDF document text
- https://www.misceren.com/home/misceren/public_html/upload/files/coin-master-free-spin-ml_GM406889139.pdfIn PDF document text
- https://www.misceren.com/home/misceren/public_html/upload/files/free-robux-survey_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_004_off000051b3.bin`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x51B3	24788 bytes
SHA-256: `edb880bddd2e0c957626d87a5f40378d747f8a27311a3eb20967acf140450f30`
`font_01_sfnt_off00008aa0.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x8AA0	18344 bytes
SHA-256: `39633727b3da1b19457315367bbd60296b0e017efdadad2f182a1e6b8fba6602`

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