PDF malware analysis — malicious · b7a5ad41d7f5f462

MALICIOUS

PDF

48.3 KB Created: 2021-06-07 16:16:26 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04

MD5: 4fa3aa68769ee3691244633f12c9a7bc SHA-1: acf1ec0fe5828b89335e1c8fde31a261a60e1629 SHA-256: b7a5ad41d7f5f46280c9e25f17ca3a03cd1bf71f9c645ce8374d7fe1bb0395f6

160 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF document contains multiple links to external websites, including a known malicious redirector. The document body and heuristic firings indicate a lure for 'free generator / game hack' content, which is a common tactic for phishing or malware distribution. The presence of embedded URLs and the ML classifier's high confidence score support this assessment.

Machine Learning

Nyx PDF Classifier malicious score 0.9796

Heuristics 4

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.
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/hack-para-tener-robux-gratis-en-roblox-game-hack In PDF document text
- https://www.polyfin.de/images/free-robux-no-verify_GM431946152.pdfIn PDF document text
- https://www.polyfin.de/images/free-robux-no-human-verification_GM431946152.pdfIn PDF document text
- https://www.polyfin.de/images/free-robux-download_GM431946152.pdfIn PDF document text
- https://www.polyfin.de/images/coin-master-free-spins-hack-link_GM406889139.pdfIn PDF document text
- https://www.polyfin.de/images/free-robux-codes-2021_GM431946152.pdfIn PDF document text
- https://www.polyfin.de/images/minecraft-pe-hacks-2021_GM479516143.pdfIn PDF document text
- https://www.polyfin.de/images/coin-master-hack-apk_GM406889139.pdfIn PDF document text
- https://www.polyfin.de/images/how-to-make-robux_GM431946152.pdfIn PDF document text
- https://www.polyfin.de/images/real-hack-for-coin-master_GM406889139.pdfIn PDF document text
- https://www.polyfin.de/images/free-vip-roblox_GM431946152.pdfIn PDF document text
- https://www.polyfin.de/images/robloxmatchcom-free-robux_GM431946152.pdfIn PDF document text
- https://www.polyfin.de/images/free-robux-by-watching-ads_GM431946152.pdfIn PDF document text
- https://www.polyfin.de/images/free-roblox-items-codes_GM431946152.pdfIn PDF document text
- https://www.polyfin.de/images/coin-master-daily-free-spins_GM406889139.pdfIn PDF document text
- https://www.polyfin.de/images/coin-master-free-spins-and-coins-blogspot_GM406889139.pdfIn PDF document text
- https://www.polyfin.de/images/coin-master-daily-free-spins-link-today_GM406889139.pdfIn PDF document text
- https://www.polyfin.de/images/get-free-robux-no-human-verification_GM431946152.pdfIn PDF document text
- https://www.polyfin.de/images/coin-master-free-spin-link-today-2021_GM406889139.pdfIn PDF document text
- https://www.polyfin.de/images/coin-master-hack-2021-download_GM406889139.pdfIn PDF document text
- https://www.polyfin.de/images/free-robux-come_GM431946152.pdfIn PDF document text
- https://www.micIn 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_004_off00004f76.bin`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x4F76	24808 bytes
SHA-256: `af1b79d662c0206ea811038e5f0d9bb78024b38f39af2e0ef54bc241c7fa14b8`
`font_01_sfnt_off0000889c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x889C	6700 bytes
SHA-256: `ae114634718854704d615808d33fb1b747d90eb28e420080bd5adbdfe7fb6a27`
`font_02_sfnt_off000098da.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x98DA	18700 bytes
SHA-256: `0e420d58d089025a8e3760e47e4a3d4d63b9d0635fec7dc814d3a1434f2d41a0`

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