Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e4e1283b3e6ac38…

MALICIOUS

PDF

39.9 KB Created: 2021-05-24 13:36:58 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 0bb1f603c5f02db7c5adfda82bb54cb8 SHA-1: 0ca8e7d517ad8a4878f15b2189ac9e2c68929e94 SHA-256: 9e4e1283b3e6ac38e9799325468d0b4a8877c4ff859e36cf44702bceed86be31
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to redirector infrastructure, specifically advertising 'free Robux' and 'game hacks' to entice users. The document body and heuristics indicate a lure designed to trick users into downloading further content. No scripts were extracted, but the presence of malicious redirector links and the overall lure suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8060

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/free-robux-kid-friendly-no-human-verification-game-hack In PDF document text
    • http://yochin.org.tw/images/how-to-get-free-spins-on-coin-master-iphone_GM406889139.pdfIn PDF document text
    • http://yochin.org.tw/images/minecraft-apk-free-download_GM479516143.pdfIn PDF document text
    • http://yochin.org.tw/images/is-tiktok-free_GM835599320.pdfIn PDF document text
    • http://yochin.org.tw/images/coin-master-free-spin-and-coin-link-2021-today_GM406889139.pdfIn PDF document text
    • http://yochin.org.tw/images/cute-free-hair-on-roblox_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off00003323.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3323 25756 bytes
SHA-256: 6bd8dc9a4c094b4e92bfe68a78d4e325b005b57700488aa5370c6e959c96feff
font_01_sfnt_off00006cd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6CD1 3112 bytes
SHA-256: 471f662098e83c5562504503f5e7603b336ca0957605358090bb98e15c7aed80
font_02_sfnt_off0000778b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x778B 19288 bytes
SHA-256: ea469787df873758e357019bb53a1e3c4242eb718badaf8706c42bdc2f61c813

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