PDF malware analysis — malicious · bcfd0a2f5b2efa6b

MALICIOUS

PDF

46.8 KB Created: 2021-05-17 16:00:35 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-18

MD5: 75e4a589e0a90e3a6f68405d8804ad08 SHA-1: ab439834f4e9192d7803bfef7d612480a6a9584c SHA-256: bcfd0a2f5b2efa6b3e446d9c7a0ee60ac26d3aaeb0e76603b1c0e29ec772492f

142 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, 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 0.8575

Heuristics 5

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.
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.
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.xyz/app/431946152/free-group-roblox-game-hack PDF link annotation
- https://ethraa.ae/userfiles/files/safe-hack-for-coin-master-android_GM406889139.pdfIn PDF document text
- https://ethraa.ae/userfiles/files/websites-that-give-free-robux_GM431946152.pdfIn PDF document text
- https://ethraa.ae/userfiles/files/how-to-get-free-spins-and-coins-in-coin-master_GM406889139.pdfIn PDF document text
- https://ethraa.ae/userfiles/files/free-realistic-minecraft-texture-packs_GM479516143.pdfIn PDF document text
- https://ethraa.ae/userfiles/files/best-free-spins-link-coin-master_GM406889139.pdfIn PDF document text
- https://ethraa.ae/userfiles/files/minecraft-win-10-free_GM479516143.pdfIn PDF document text
- https://ethraa.ae/userfiles/files/robux-hack-free-robux_GM431946152.pdfIn PDF document text
- https://ethraa.ae/userfiles/files/is-minecraft-free-on-pc_GM479516143.pdfIn PDF document text
- https://ethraa.ae/userfiles/files/free-spins-coin-master-links-app_GM406889139.pdfIn PDF document text
- https://ethraa.ae/userfiles/files/free-robux-hack-no-human-verification-or-survey_GM431946152.pdfIn PDF document text
- https://ethraa.ae/userfiles/files/how-to-get-free-hair-on-roblox_GM431946152.pdfIn PDF document text
- https://ethraa.ae/userfiles/files/hack-coin-master-without-verification_GM406889139.pdfIn PDF document text
- https://ethraa.ae/userfiles/files/free-robux-no-human-verify_GM431946152.pdfIn PDF document text
- https://ethraa.ae/userfiles/files/roblox-free-rubox_GM431946152.pdfIn PDF document text
- https://ethraa.ae/userfiles/files/113-hacked-client_GM479516143.pdfIn PDF document text
- https://ethraa.ae/userfiles/files/free-coin-master-spin-and-coin-link_GM406889139.pdfIn PDF document text
- https://ethraa.ae/userfiles/files/como-hackear-juego-coin-master_GM406889139.pdfIn PDF document text
- https://ethraa.ae/userfiles/files/free-robux-co_GM431946152.pdfIn PDF document text
- https://ethraa.ae/userfiles/files/free-roblox-followers-generator_GM431946152.pdfIn PDF document text
- https://ethraa.ae/userfiles/files/robux-adder_GM431946152.pdfIn PDF document text
- https://www.communes.comIn 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_off000048ad.bin`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x48AD	25932 bytes
SHA-256: `1ae9a84330ead7f8aedcf9d2203cf6247b45be41f414d44f6842ae58fe84b2f0`
`font_01_sfnt_off0000848e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x848E	5696 bytes
SHA-256: `450e3ee45915afe13702bf1d587eb8b9ad88a8d2113419ac9f2fd116a828e139`
`font_02_sfnt_off0000919f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x919F	19176 bytes
SHA-256: `43b285aa32564dd20dfeb0e24ff010307ceaf329a94c32aea2413b05cddc1fc3`

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