Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6ba52deb4855f0b…

MALICIOUS

PDF

33.3 KB Created: 2021-07-03 18:56:58 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 9e943e543445b57d5ba8b1e4d4ed8df1 SHA-1: 20e0dfe560dbdaae9ef7fe06359fde736a6b0592 SHA-256: f6ba52deb4855f0b9b2b3229e9ced593fe033af3fd0ff9d53a60ea604607dde5
180 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains a malicious link that redirects to known malicious infrastructure, likely as part of a scam or phishing attempt. The ML classifier strongly indicated maliciousness, and the malformed stream suggests an attempt to obfuscate exploit code. The document body contains numerous URLs related to game hacks and free currency, reinforcing the lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

Heuristics 5

  • 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.
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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/479516143/mcpe-game-hack In PDF document text
    • https://kab-gianyar.kpu.go.id/new/public/ckfinder/userfiles/files/coin-master-working-hack_GM406889139.pdfIn PDF document text
    • https://kab-gianyar.kpu.go.id/new/public/ckfinder/userfiles/files/ho-to-make-a-shirt-in-roblox-2021-for-free_GM431946152.pdfIn PDF document text
    • https://kab-gianyar.kpu.go.id/new/public/ckfinder/userfiles/files/free-robux-groups-2021_GM431946152.pdfIn PDF document text
    • https://kab-gianyar.kpu.go.id/new/public/ckfinder/userfiles/files/free-spins-coin-master-android_GM406889139.pdfIn PDF document text
    • https://kab-gianyar.kpu.go.id/new/public/ckfinder/userfiles/files/free-robux-just-enter-username-and-password_GM431946152.pdfIn PDF document text
    • https://kab-gianyar.kpu.go.id/new/public/ckfinder/userfiles/files/roblox-prison-life-btools-hack_GM431946152.pdfIn PDF document text
    • https://kab-gianyar.kpu.go.id/new/public/ckfinder/userfiles/files/cheat-argent-sur-roblox-vhicule-simulator_GM431946152.pdfIn PDF document text
    • https://kab-gianyar.kpu.go.id/new/public/ckfinder/userfiles/files/roblox-free-robux-generator_GM431946152.pdfIn PDF document text
    • https://kab-gianyar.kpu.go.id/new/public/ckfinder/userfiles/files/coin-master-hack-apk-download_GM406889139.pdfIn PDF document text
    • https://kab-gianyar.kpu.go.id/new/public/ckfinder/userfiles/files/how-to-make-a-minecraft-server-for-free_GM479516143.pdfIn PDF document text
    • https://kab-gianyar.kpu.go.id/new/public/ckfinder/userfiles/files/pokemon-go-free-version_GM1094591345.pdfIn PDF document text
    • https://kab-gianyar.kpu.go.id/new/public/ckfinder/userfiles/files/como-hackear-el-juego-coin-master_GM406889139.pdfIn PDF document text
    • https://kab-gianyar.kpu.go.id/new/public/ckfinder/userfiles/files/how-to-get-free-robux-xtimothyy_GM431946152.pdfIn PDF document text
    • https://kab-gianyar.kpu.go.id/new/public/ckfinder/userfiles/files/free-robux-hack-on-ipad_GM431946152.pdfIn PDF document text
    • https://kab-gianyar.kpu.go.id/new/public/ckfinder/userfiles/files/robux-com-free-robux_GM431946152.pdfIn PDF document text
    • https://kab-gianyar.kpu.go.id/new/public/ckfinder/userfiles/files/free-400-spins-coins-master_GM406889139.pdfIn PDF document text
    • https://kab-gianyar.kpu.go.id/new/public/ckfinder/userfiles/files/roblox-hack-descargar-para-pc-robux_GM431946152.pdfIn PDF document text
    • https://kab-gianyar.kpu.go.id/new/public/ckfinder/userfiles/files/bux-gg-robux-free_GM431946152.pdfIn PDF document text
    • https://kab-gianyar.kpu.go.id/new/public/ckfinder/userfiles/files/best-free-roblox-outfits_GM431946152.pdfIn PDF document text
    • https://kab-gianyar.kpu.go.id/new/public/ckfinder/userfiles/files/free-doge-mask-in-roblox_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
font_00_sfnt_off00002f83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2F83 22372 bytes
SHA-256: 32d66ecd6c20683d560f61b6e93291eda24f124e48756aa53a977df7b41b1d15
font_01_sfnt_off000060c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x60C3 17808 bytes
SHA-256: bb08dbf34a52122f895504de6d0f043fb34325a43da687a59d3db3469e279ba9

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