Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d9da587ac7a15d8…

MALICIOUS

PDF

35.8 KB Created: 2021-07-07 06:55:27 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 16f5424e8818c102f8106b676085529c SHA-1: b0d5bd92e39289675c20d08a0ac150669ff6781f SHA-256: 8d9da587ac7a15d83bfdc9be12c8be21b69ed5e9350de8f2584ce04817e8ec0d
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains embedded links that lead to a malicious redirector, disguised as a generator for free game currency and hacks. The ML classifier strongly flagged this PDF as malicious. The primary IOC is the redirector URL, which likely serves as a gateway to further malicious content or downloads.

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.tw/app/406889139/coin-master-free-spins-hack-apk-download-game-hack In PDF document text
    • https://kab-gianyar.kpu.go.id/new/public/ckfinder/userfiles/files/stealer-hack-roblox_GM431946152.pdfIn PDF document text
    • https://kab-gianyar.kpu.go.id/new/public/ckfinder/userfiles/files/minecraft-bedrock-edition-free-with-java_GM479516143.pdfIn PDF document text
    • https://kab-gianyar.kpu.go.id/new/public/ckfinder/userfiles/files/coin-master-hack-2021-download_GM406889139.pdfIn PDF document text
    • https://kab-gianyar.kpu.go.id/new/public/ckfinder/userfiles/files/free-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://kab-gianyar.kpu.go.id/new/public/ckfinder/userfiles/files/free-robux-generator-codes_GM431946152.pdfIn PDF document text
    • https://kab-gianyar.kpu.go.id/new/public/ckfinder/userfiles/files/roblox-hack-robux-free-deutsch_GM431946152.pdfIn PDF document text
    • https://kab-gianyar.kpu.go.id/new/public/ckfinder/userfiles/files/free-robux-games-that-actually-work-2021_GM431946152.pdfIn PDF document text
    • https://kab-gianyar.kpu.go.id/new/public/ckfinder/userfiles/files/free-premium-roblox-accounts_GM431946152.pdfIn PDF document text
    • https://kab-gianyar.kpu.go.id/new/public/ckfinder/userfiles/files/free-promo-codes-for-robux_GM431946152.pdfIn PDF document text
    • https://kab-gianyar.kpu.go.id/new/public/ckfinder/userfiles/files/free-robux-redeem-codes_GM431946152.pdfIn PDF document text
    • https://kab-gianyar.kpu.go.id/new/public/ckfinder/userfiles/files/coin-master-hack-spins-free_GM406889139.pdfIn PDF document text
    • https://kab-gianyar.kpu.go.id/new/public/ckfinder/userfiles/files/free-robux-without-verification_GM431946152.pdfIn PDF document text
    • https://kab-gianyar.kpu.go.id/new/public/ckfinder/userfiles/files/free-robux-no-verification-or-survey_GM431946152.pdfIn PDF document text
    • https://kab-gianyar.kpu.go.id/new/public/ckfinder/userfiles/files/free-clothing-on-roblox_GM431946152.pdfIn PDF document text
    • https://kab-gianyar.kpu.go.id/new/public/ckfinder/userfiles/files/blox-rewards_GM431946152.pdfIn PDF document text
    • https://kab-gianyar.kpu.go.id/new/public/ckfinder/userfiles/files/roblox-land-free-robux_GM431946152.pdfIn PDF document text
    • https://kab-gianyar.kpu.go.id/new/public/ckfinder/userfiles/files/uprobuxcom-free-robux_GM431946152.pdfIn PDF document text
    • https://kab-gianyar.kpu.go.id/new/public/ckfinder/userfiles/files/how-to-get-free-followers-on-roblox_GM431946152.pdfIn PDF document text
    • https://kab-gianyar.kpu.go.id/new/public/ckfinder/userfiles/files/tiktok-free-likes_GM835599320.pdfIn PDF document text
    • https://kab-gianyar.kpu.go.id/new/public/ckfinder/userfiles/files/roblox-pink-free-robux_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_002_off00003357.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3357 23184 bytes
SHA-256: 03716ad6f4f410242fda66b948501d05b3818781fc176b65beea895517a6f2c0
font_01_sfnt_off000067a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x67A4 18924 bytes
SHA-256: 5f265c6d24676a8426621fea6e3781f16e4a39cf4ab57530a0876d9f7c567a0a

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