PDF malware analysis — malicious · 8b5d826c0bc2e29e

MALICIOUS

PDF

35.3 KB Created: 2021-07-01 20:57:15 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04

MD5: 75d2b4d70769fb826fe68cd9a46a32be SHA-1: 13abea211504bddfe2d4aaa478f33713cce3cc82 SHA-256: 8b5d826c0bc2e29e903405ffc3b8ad294cb2f6e6bab0b0eb2b747ffac7becd7c

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 at http://netcdn.co/app/431946152/free-robux-today-game-hack. The document body and heuristics indicate a lure for 'free Robux' or game hacks, a common social engineering tactic to trick users into visiting malicious sites. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect the user to a potentially harmful resource, likely for credential harvesting or malware distribution.

Machine Learning

Nyx PDF Classifier malicious score 0.9980

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.co/app/431946152/free-robux-today-game-hack In PDF document text
- http://www.sharp-calculators.com/files/ckfinder/files/how-to-get-free-robux-on-iphone_GM431946152.pdfIn PDF document text
- http://www.sharp-calculators.com/files/ckfinder/files/free-promo-codes-roblox_GM431946152.pdfIn PDF document text
- http://www.sharp-calculators.com/files/ckfinder/files/roblox-army-free-robux_GM431946152.pdfIn PDF document text
- http://www.sharp-calculators.com/files/ckfinder/files/roblox-free-clothes-hack_GM431946152.pdfIn PDF document text
- http://www.sharp-calculators.com/files/ckfinder/files/free-minecraft-skins-pe_GM479516143.pdfIn PDF document text
- http://www.sharp-calculators.com/files/ckfinder/files/coin-master-free-spins-app_GM406889139.pdfIn PDF document text
- http://www.sharp-calculators.com/files/ckfinder/files/android-coin-master-3433-apk-hack_GM406889139.pdfIn PDF document text
- http://www.sharp-calculators.com/files/ckfinder/files/how-to-get-free-robux-on-ipad_GM431946152.pdfIn PDF document text
- http://www.sharp-calculators.com/files/ckfinder/files/minecraft-java-free-trial_GM479516143.pdfIn PDF document text
- http://www.sharp-calculators.com/files/ckfinder/files/free-robux-codes-generator-no-verification_GM431946152.pdfIn PDF document text
- http://www.sharp-calculators.com/files/ckfinder/files/coin-master-heaven-links_GM406889139.pdfIn PDF document text
- http://www.sharp-calculators.com/files/ckfinder/files/coin-master-free-spins-link-2021-no-verification-deutsch_GM406889139.pdfIn PDF document text
- http://www.sharp-calculators.com/files/ckfinder/files/free-robux-for-kids_GM431946152.pdfIn PDF document text
- http://www.sharp-calculators.com/files/ckfinder/files/coin-master-free-spins-link-download-for-iphone_GM406889139.pdfIn PDF document text
- http://www.sharp-calculators.com/files/ckfinder/files/easy-way-to-get-free-robux_GM431946152.pdfIn PDF document text
- http://www.sharp-calculators.com/files/ckfinder/files/how-to-get-free-spins-on-coin-master-facebook_GM406889139.pdfIn PDF document text
- http://www.sharp-calculators.com/files/ckfinder/files/minecraft-pocket-edition-mods-for-free_GM479516143.pdfIn PDF document text
- http://www.sharp-calculators.com/files/ckfinder/files/tiktok-free-recharge_GM835599320.pdfIn PDF document text
- http://www.sharp-calculators.com/files/ckfinder/files/freer-pro-tiktok_GM835599320.pdfIn PDF document text
- http://www.sharp-calculators.com/files/ckfinder/files/coin-master-free-spins-link-blogspot-today_GM406889139.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_off00003239.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x3239	22568 bytes
SHA-256: `4bc881d69535e0f1da0efde4f2a56b196d611bd619611f077c1db0435ad77236`
`font_01_sfnt_off000064ad.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x64AD	19072 bytes
SHA-256: `46cfca18e06d620ca18af6b576997b97068e9f2425fa6aacc62e6f72c392fa15`

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