PDF malware analysis — malicious · b3edfaed9b71cbe4

MALICIOUS

PDF

45.8 KB Created: 2021-05-11 16:07:48 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-22

MD5: e00156c363d4f0b881b53e492451cd74 SHA-1: fc930d19b10fc815af0d301356925e3838c21149 SHA-256: b3edfaed9b71cbe406dfe076d55875c766c158c9822b74c20cc74c7a01479809

260 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF document employs a fake CAPTCHA lure to trick users into clicking malicious links, disguised as game hacks or free generator offers. The document contains numerous links to external PDFs hosted on `diendientuvn.com` and a primary redirector URL `netcdn.xyz`, suggesting a phishing or scam campaign. No scripts were extracted, but the embedded URLs and the lure mechanism strongly indicate a malicious intent to redirect users to potentially harmful content.

Machine Learning

Nyx PDF Classifier malicious score 0.9432

Heuristics 6

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.
Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM

Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
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.xyz/app/406889139/moonactive-free-spins-2021-game-hack In PDF document text
- https://diendientuvn.com/public/upload/files/how-to-get-minecraft-for-free-on-nintendo-switch_GM479516143.pdfIn PDF document text
- https://diendientuvn.com/public/upload/files/how-to-get-free-robux-without-doing-anything-2021_GM431946152.pdfIn PDF document text
- https://diendientuvn.com/public/upload/files/mcpe-master-hack-coin-apk_GM406889139.pdfIn PDF document text
- https://diendientuvn.com/public/upload/files/how-to-play-minecraft-with-friends-for-free_GM479516143.pdfIn PDF document text
- https://diendientuvn.com/public/upload/files/free-spins-coin-master-hack-2021_GM406889139.pdfIn PDF document text
- https://diendientuvn.com/public/upload/files/coin-master-hack-2021_GM406889139.pdfIn PDF document text
- https://diendientuvn.com/public/upload/files/coin-master-hack-uk_GM406889139.pdfIn PDF document text
- https://diendientuvn.com/public/upload/files/how-to-hack-roblox-accounts-for-robux_GM431946152.pdfIn PDF document text
- https://diendientuvn.com/public/upload/files/how-to-get-free-things-on-roblox_GM431946152.pdfIn PDF document text
- https://diendientuvn.com/public/upload/files/coin-master-claim-spins_GM406889139.pdfIn PDF document text
- https://diendientuvn.com/public/upload/files/free-robux-generator-no-verification_GM431946152.pdfIn PDF document text
- https://diendientuvn.com/public/upload/files/minecraft-pe-hacks_GM479516143.pdfIn PDF document text
- https://diendientuvn.com/public/upload/files/coin-master-free-spin-ml_GM406889139.pdfIn PDF document text
- https://diendientuvn.com/public/upload/files/coin-master-spin-hack-link_GM406889139.pdfIn PDF document text
- https://diendientuvn.com/public/upload/files/roblox-top_GM431946152.pdfIn PDF document text
- https://diendientuvn.com/public/upload/files/do-you-get-minecraft-windows-10-for-free_GM479516143.pdfIn PDF document text
- https://diendientuvn.com/public/upload/files/free-roblox-passwords_GM431946152.pdfIn PDF document text
- https://diendientuvn.com/public/upload/files/how-to-get-free-spins-and-coins-on-coin-master_GM406889139.pdfIn PDF document text
- https://diendientuvn.com/public/upload/files/coin-master-hack-using-cheat-engine_GM406889139.pdfIn PDF document text
- https://diendientuvn.com/public/upload/files/how-to-get-minecraft-for-free-on-mobile_GM479516143.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_003_off00004cf2.bin`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x4CF2	24868 bytes
SHA-256: `59607c851efb998fa5d99d8c97bf753944b6724cf995fc629ca5b6a4614df36b`
`font_01_sfnt_off00008580.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x8580	18400 bytes
SHA-256: `92ca299d7509cbf0a27ca4bb2455c3f9e24f9e6a05476c47560d59a1eb9d663e`
`font_02_sfnt_off0000a7f8.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xA7F8	3264 bytes
SHA-256: `e32c06502c11b52acb5e814091c5fdbffd1e2a904ac7a9cfb8b5b180bd139088`

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