PDF malware analysis — malicious · 5fa79f6ab173144d

MALICIOUS

PDF

31.3 KB Created: 2021-07-20 06:30:58 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04

MD5: 71dbac6340e6aa9dd0ef8dd024d73196 SHA-1: 72a23acde77fba924e6473104d98e89fe5a784fd SHA-256: 5fa79f6ab173144ddc2c600c7bd2989bcfb7129dd4918932c8ad96edad1955d0

160 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF document contains multiple links to known malicious redirectors and hosts further malicious PDFs, masquerading as generators for in-game currency or hacks. The document body text and embedded URLs strongly suggest a lure for users seeking free in-game items, which is a common social engineering tactic. No scripts were extracted, but the presence of malicious links and the ML classifier's high confidence indicate a high likelihood of a malicious workflow.

Machine Learning

Nyx PDF Classifier malicious score 0.9893

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 http://netcdn.tw/app/431946152/free-robux-no-offers-game-hack In PDF document text
- http://kfz-service-etp.de/images/robux-hacks-2021_GM431946152.pdfIn PDF document text
- http://kfz-service-etp.de/images/how-to-get-robux-for-free-2021_GM431946152.pdfIn PDF document text
- http://kfz-service-etp.de/images/tiktok-followers-for-free_GM835599320.pdfIn PDF document text
- http://kfz-service-etp.de/images/free-minecraft-alt-generator_GM479516143.pdfIn PDF document text
- http://kfz-service-etp.de/images/how-to-hack-into-someones-roblox-account_GM431946152.pdfIn PDF document text
- http://kfz-service-etp.de/images/free-spin-coin-master-link-2021_GM406889139.pdfIn PDF document text
- http://kfz-service-etp.de/images/free-robux-promo-codes_GM431946152.pdfIn PDF document text
- http://kfz-service-etp.de/images/free-spins-coin-master_GM406889139.pdfIn PDF document text
- http://kfz-service-etp.de/images/roblox-land-free-robux_GM431946152.pdfIn PDF document text
- http://kfz-service-etp.de/images/how-to-download-minecraft-for-free-on-pc_GM479516143.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_off00002835.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x2835	21704 bytes
SHA-256: `3016836e32e3cd8a878e39fecb994731d2555eb31b8dad2333d564b07c6167d4`
`font_01_sfnt_off00005832.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x5832	18200 bytes
SHA-256: `9667d64c08376f15d8cfb45c3aacba43ac1d421472699037c9c528d853194b66`

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