PDF malware analysis — malicious · 874b1c53f7b34e16

MALICIOUS

PDF

34.1 KB Created: 2021-06-30 05:22:45 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-18

MD5: 3f44d5baba4759e3ce13e56c7abb08f9 SHA-1: a9c1a5ac4e9110f666096f1e84eaaaa6fe6787ab SHA-256: 874b1c53f7b34e16b560f5d987c9d39e46ec9cb154e7a309cdad424ca8f75bb2

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 0.9980

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 http://netcdn.co/app/431946152/roblox-free-domino-crown-game-hack PDF link annotation
- https://biospray-online.com/ckfinder/userfiles/files/abd-roblox_GM431946152.pdfIn PDF document text
- https://biospray-online.com/ckfinder/userfiles/files/roblox-buy-robux-button-inspect-hack_GM431946152.pdfIn PDF document text
- https://biospray-online.com/ckfinder/userfiles/files/how-to-hack-lumber-tycoon-2-roblox_GM431946152.pdfIn PDF document text
- https://biospray-online.com/ckfinder/userfiles/files/robux-free-gift-card-org-hack_GM431946152.pdfIn PDF document text
- https://biospray-online.com/ckfinder/userfiles/files/como-sacar-buen-puntaje-en-juego-coin-master-free-spins_GM406889139.pdfIn PDF document text
- https://biospray-online.com/ckfinder/userfiles/files/how-to-get-free-hair-in-roblox_GM431946152.pdfIn PDF document text
- https://biospray-online.com/ckfinder/userfiles/files/how-to-get-minecraft-java-for-free_GM479516143.pdfIn PDF document text
- https://biospray-online.com/ckfinder/userfiles/files/coin-master-free-spins-app_GM406889139.pdfIn PDF document text
- https://biospray-online.com/ckfinder/userfiles/files/new-free-spins-coin-master_GM406889139.pdfIn PDF document text
- https://biospray-online.com/ckfinder/userfiles/files/coin-master-daily-free-spins-link_GM406889139.pdfIn PDF document text
- https://biospray-online.com/ckfinder/userfiles/files/free-robux-no-offers_GM431946152.pdfIn PDF document text
- https://biospray-online.com/ckfinder/userfiles/files/comment-hacker-roblox-facilement-sur-pc-2021-en-francais_GM431946152.pdfIn PDF document text
- https://biospray-online.com/ckfinder/userfiles/files/coin-master-free-spins-glitch_GM406889139.pdfIn PDF document text
- https://biospray-online.com/ckfinder/userfiles/files/hacks-para-tener-robux-gratis_GM431946152.pdfIn PDF document text
- https://biospray-online.com/ckfinder/userfiles/files/robux-generator-no-verification-2021_GM431946152.pdfIn PDF document text
- https://biospray-online.com/ckfinder/userfiles/files/minecraft-hacks-115-2_GM479516143.pdfIn PDF document text
- https://biospray-online.com/ckfinder/userfiles/files/how-to-get-free-robux-no-survey_GM431946152.pdfIn PDF document text
- https://biospray-online.com/ckfinder/userfiles/files/free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
- https://biospray-online.com/ckfinder/userfiles/files/coin-master-free-spins-2021_GM406889139.pdfIn PDF document text
- https://biospray-online.com/ckfinder/userfiles/files/descendants-2-on-roblox-that-is-free-from-intel_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
`font_00_sfnt_off00002e76.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x2E76	21988 bytes
SHA-256: `7b8dd8112472fc0548089e1268c6e7d9f12a708294f8219cdc5749c1df0a9ee2`
`font_01_sfnt_off00005f33.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x5F33	19364 bytes
SHA-256: `9064a3c70da71642e42590b265643047d986b1a34ba965a4e85ef4d0d90c69c8`

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