PDF malware analysis — malicious · c8bdbb2c7c11d304

MALICIOUS

PDF

46.3 KB Created: 2021-06-03 08:00:07 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-23

MD5: 38cefc0b12bcaabcf6ef900f38169dc2 SHA-1: 13980903ed2af762abfabb43c24c3315124e5faa SHA-256: c8bdbb2c7c11d304d2fc8ae081f17ef6c85a410545bc8fefe220bd4ec3574155

122 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. It uses 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 malicious score 0.9748

Heuristics 5

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
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 https://netcdn.online/app/431946152/free-robux-hack-generator-game-hack PDF link annotation
- http://www.6636.com.tw/ad6636/upload/files/earn-free-robux-on-roblox_GM431946152.pdfIn PDF document text
- http://www.6636.com.tw/ad6636/upload/files/coin-master-daily-free-spins-link-today_GM406889139.pdfIn PDF document text
- http://www.6636.com.tw/ad6636/upload/files/free-roblox-girl-hair-not-a-model_GM431946152.pdfIn PDF document text
- http://www.6636.com.tw/ad6636/upload/files/minecraft-nintendo-switch-digital-code-free_GM479516143.pdfIn PDF document text
- http://www.6636.com.tw/ad6636/upload/files/hack-coin-master-net_GM406889139.pdfIn PDF document text
- http://www.6636.com.tw/ad6636/upload/files/coin-master-blogspot_GM406889139.pdfIn PDF document text
- http://www.6636.com.tw/ad6636/upload/files/coin-master-35-16-hack-apk_GM406889139.pdfIn PDF document text
- http://www.6636.com.tw/ad6636/upload/files/how-to-hack-roblox-accounts-2021-easy_GM431946152.pdfIn PDF document text
- http://www.6636.com.tw/ad6636/upload/files/microsoft-store-robux_GM431946152.pdfIn PDF document text
- http://www.6636.com.tw/ad6636/upload/files/coin-master-free-spin-and-coins-links_GM406889139.pdfIn PDF document text
- http://www.6636.com.tw/ad6636/upload/files/minecraft-bedrock-edition-pc-download-free_GM479516143.pdfIn PDF document text
- http://www.6636.com.tw/ad6636/upload/files/coin-master-free-chip_GM406889139.pdfIn PDF document text
- http://www.6636.com.tw/ad6636/upload/files/coin-master-free-spins-link_GM406889139.pdfIn PDF document text
- http://www.6636.com.tw/ad6636/upload/files/free-spins-in-coin-master-2021_GM406889139.pdfIn PDF document text
- http://www.6636.com.tw/ad6636/upload/files/free-roblox-codes-2021-not-expired_GM431946152.pdfIn PDF document text
- http://www.6636.com.tw/ad6636/upload/files/coin-master-hack-online-download_GM406889139.pdfIn PDF document text
- http://www.6636.com.tw/ad6636/upload/files/roblox-speed-hack_GM431946152.pdfIn PDF document text
- http://www.6636.com.tw/ad6636/upload/files/www-robux-com_GM431946152.pdfIn PDF document text
- http://www.6636.com.tw/ad6636/upload/files/coin-master-hack-tool-2021_GM406889139.pdfIn PDF document text
- http://www.6636.com.tw/ad6636/upload/files/legitimate-coin-master-free-spins-apk_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
`font_00_sfnt_off00004fde.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x4FDE	24588 bytes
SHA-256: `6f7eb8c51c0da81fa2d699656c3358e03d6b99ea92495a64536890e3e24bbc6e`
`font_01_sfnt_off0000878b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x878B	2876 bytes
SHA-256: `0f99604d55dac6626711b4d750768ca349af54a6e3d7fe8709188b59b2479d46`
`font_02_sfnt_off00009174.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x9174	18516 bytes
SHA-256: `ac45002ee2c78c55a094f6344a5e95abe10f4ed7f4298fc77d5376065a98214b`

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