Malicious PDF — malware analysis report

Static analysis result for SHA-256 a71a2b11921ccd4f…

MALICIOUS

PDF

43.8 KB Created: 2021-06-03 03:53:22 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 1ebac34c6f705cd436adbc28941a11f4 SHA-1: bc292e733c99524121b8ae20702584aaa7ae62f5 SHA-256: a71a2b11921ccd4fb84f80f14e5c415276ced77b2aa4e697d2bd0247616295a2
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains multiple links to redirectors and malicious infrastructure, disguised as "free generator" or "game hack" lures. The ML classifier strongly indicated maliciousness. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect the user to a site that likely hosts further malicious content or phishing forms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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.online/app/406889139/free-spins-coin-master-generator-game-hack In PDF document text
    • https://esl.hess.com.tw/image/data/files/how-to-get-free-roebucks_GM431946152.pdfIn PDF document text
    • https://esl.hess.com.tw/image/data/files/coin-master-free-spins-link-no-verification-2021_GM406889139.pdfIn PDF document text
    • https://esl.hess.com.tw/image/data/files/free-robux-easy-and-fast_GM431946152.pdfIn PDF document text
    • https://esl.hess.com.tw/image/data/files/roblox-svg-free_GM431946152.pdfIn PDF document text
    • https://esl.hess.com.tw/image/data/files/microsoft-store-robux_GM431946152.pdfIn PDF document text
    • https://esl.hess.com.tw/image/data/files/coin-master-hack-download-android_GM406889139.pdfIn PDF document text
    • https://esl.hess.com.tw/image/data/files/como-hackear-coin-master-ios_GM406889139.pdfIn PDF document text
    • https://esl.hess.com.tw/image/data/files/spin-and-coin-link_GM406889139.pdfIn PDF document text
    • https://esl.hess.com.tw/image/data/files/how-to-get-tiktok-famous-free_GM835599320.pdfIn PDF document text
    • https://esl.hess.com.tw/image/data/files/how-do-we-get-free-robux_GM431946152.pdfIn PDF document text
    • https://esl.hess.com.tw/image/data/files/easy-coin-master-hack-without-verification_GM406889139.pdfIn PDF document text
    • https://esl.hess.com.tw/image/data/files/offers-to-complete-and-get-free-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • https://esl.hess.com.tw/image/data/files/coin-master-free-spin-no-offers_GM406889139.pdfIn PDF document text
    • https://esl.hess.com.tw/image/data/files/minecraft-clipart-free_GM479516143.pdfIn PDF document text
    • https://esl.hess.com.tw/image/data/files/buy-robux-free_GM431946152.pdfIn PDF document text
    • https://esl.hess.com.tw/image/data/files/poke-coins-pokemon-go-free_GM1094591345.pdfIn PDF document text
    • https://esl.hess.com.tw/image/data/files/how-do-you-hack-roblox_GM431946152.pdfIn PDF document text
    • https://esl.hess.com.tw/image/data/files/pokemon-go-free-download-for-pc_GM1094591345.pdfIn PDF document text
    • https://esl.hess.com.tw/image/data/files/free-spin-generator-for-coin-master_GM406889139.pdfIn PDF document text
    • https://esl.hess.com.tw/image/data/files/what-games-give-you-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_004_off000052c4.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x52C4 24048 bytes
SHA-256: 8e0552e86fd2673984243ce5141205d9050f7f52c279229b8b03c4d35594b3cd
font_01_sfnt_off000089ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x89AE 17884 bytes
SHA-256: 4dbd7a0cfee3c9b81196055844221830545f0b5886b4093cfa91146119426c66

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