Malicious PDF — malware analysis report

Static analysis result for SHA-256 78ddb317fc0d99e6…

MALICIOUS

PDF

41.9 KB Created: 2021-05-14 08:00:26 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 590ce8501d0129a1382987b50504635a SHA-1: 3bdf50bad47d2eeacdb61d28eaea2c9324298c4e SHA-256: 78ddb317fc0d99e6f65786a55d6998eb5d56cbf8d80e78bcc4a41143e44a019e
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, under the guise of 'free Robux' or 'game hacks'. The heuristic firings indicate that the PDF is designed to redirect users to potentially harmful content, likely a scam or phishing attempt. While no scripts were explicitly extracted, the PDF structure and embedded links strongly suggest a malicious intent to trick users into visiting malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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.xyz/app/431946152/get-free-robux-com-game-hack In PDF document text
    • http://yochin.org.tw/images/rbx-place-free-robux_GM431946152.pdfIn PDF document text
    • http://yochin.org.tw/images/robuxmatch-com-free-robux_GM431946152.pdfIn PDF document text
    • http://yochin.org.tw/images/robux-for-surveys_GM431946152.pdfIn PDF document text
    • http://yochin.org.tw/images/minecraft-games-to-play-for-free_GM479516143.pdfIn PDF document text
    • http://yochin.org.tw/images/free-coins-and-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://yochin.org.tw/images/coin-master-hack-2021-free_GM406889139.pdfIn PDF document text
    • http://yochin.org.tw/images/how-to-get-800-robux-for-free_GM431946152.pdfIn PDF document text
    • http://yochin.org.tw/images/free-robux-2021_GM431946152.pdfIn PDF document text
    • http://yochin.org.tw/images/apps-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • http://yochin.org.tw/images/promo-code-free-robux_GM431946152.pdfIn PDF document text
    • http://yochin.org.tw/images/coin-master-free-spin-link-today-2021_GM406889139.pdfIn PDF document text
    • http://yochin.org.tw/images/free-back-accessories-roblox_GM431946152.pdfIn PDF document text
    • http://yochin.org.tw/images/roblox-exploit-scripts_GM431946152.pdfIn PDF document text
    • http://yochin.org.tw/images/websites-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://yochin.org.tw/images/roblox-prison-life-hack_GM431946152.pdfIn PDF document text
    • http://yochin.org.tw/images/free-robux-for-free_GM431946152.pdfIn PDF document text
    • http://yochin.org.tw/images/roblox-com-r_GM431946152.pdfIn PDF document text
    • http://yochin.org.tw/images/mcpe-master-hack-coin-apk_GM406889139.pdfIn PDF document text
    • http://yochin.org.tw/images/how-to-get-roblox-premium-for-free-2021_GM431946152.pdfIn PDF document text
    • http://yochin.org.tw/images/roblox-arsenal-hack_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.

FilenameKindSourceSize
stream_003_off000047cf.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x47CF 26196 bytes
SHA-256: f26b5133dbdc6754045f4e013d16b43fb8f4872fa812dcbeddfa3406003f8948
font_01_sfnt_off00008134.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8134 18376 bytes
SHA-256: 2d8882c6a342abc4889e46f94bfee9f8cbf5538b2f5dc41d172000db9622f481

Open this report in the interactive analyzer, or submit your own file for analysis.