Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa41aa9dc0e3a5c6…

MALICIOUS

PDF

33.4 KB Created: 2021-07-09 12:03:11 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 8cd1d64399b7089372a0f189c15892f7 SHA-1: 083b01f259d80201d99a3f6d404b6e5b3d35b342 SHA-256: aa41aa9dc0e3a5c6b035fffd191d4e82dbf331a8422afbac4440ead0b5b56876
160 Risk Score

Malware Insights

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

This PDF document contains multiple links that redirect to known malicious infrastructure, specifically promoting 'game hacks' and 'free generators'. The primary lure appears to be a 'make your own Minecraft server free game hack' URL. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to trick users into downloading potentially malicious content or visiting further compromised sites. The ML classifier also strongly indicated maliciousness.

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/479516143/make-your-own-minecraft-server-free-game-hack In PDF document text
    • https://knj.com.tw/image/data/files/how-do-you-hack-your-robux-on-roblox_GM431946152.pdfIn PDF document text
    • https://knj.com.tw/image/data/files/free-robux-hak-2021-on-roblox_GM431946152.pdfIn PDF document text
    • https://knj.com.tw/image/data/files/coin-master-mod-apk_GM406889139.pdfIn PDF document text
    • https://knj.com.tw/image/data/files/roblox-april-fools-hack_GM431946152.pdfIn PDF document text
    • https://knj.com.tw/image/data/files/free-roblox-girl-clothes_GM431946152.pdfIn PDF document text
    • https://knj.com.tw/image/data/files/free-robux-without-verification-2021_GM431946152.pdfIn PDF document text
    • https://knj.com.tw/image/data/files/free-roblox-sound-effects_GM431946152.pdfIn PDF document text
    • https://knj.com.tw/image/data/files/hack-master-coin-pc_GM406889139.pdfIn PDF document text
    • https://knj.com.tw/image/data/files/coin-master-hack-app-2021-download_GM406889139.pdfIn PDF document text
    • https://knj.com.tw/image/data/files/cheat-roblox-granny_GM431946152.pdfIn PDF document text
    • https://knj.com.tw/image/data/files/minecraft-114-4-download-free_GM479516143.pdfIn PDF document text
    • https://knj.com.tw/image/data/files/jailbreak-roblox-free-money-glitch_GM431946152.pdfIn PDF document text
    • https://knj.com.tw/image/data/files/roblox-script-hack_GM431946152.pdfIn PDF document text
    • https://knj.com.tw/image/data/files/how-to-hack-someone-roblox-2021_GM431946152.pdfIn PDF document text
    • https://knj.com.tw/image/data/files/get-robux-in-roblox-free_GM431946152.pdfIn PDF document text
    • https://knj.com.tw/image/data/files/cheat-roblox-jailbreak-2021-money_GM431946152.pdfIn PDF document text
    • https://knj.com.tw/image/data/files/how-to-change-your-name-for-free-roblox_GM431946152.pdfIn PDF document text
    • https://knj.com.tw/image/data/files/coin-master-free-coins-and-spins-daily_GM406889139.pdfIn PDF document text
    • https://knj.com.tw/image/data/files/roblox-mad-city-hack-money-francais_GM431946152.pdfIn PDF document text
    • https://knj.com.tw/image/data/files/roblox-account-stealing-hack-by-kingtennisbal-deutsch_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_off00002fdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2FDF 21584 bytes
SHA-256: aef33bcf1198ee314b9e2e71a594e4590ca6a4244ada05b309bf85c8f13656e4
font_01_sfnt_off00005e7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5E7B 18748 bytes
SHA-256: 63003ec613419245968a2153146fc981bbf37ebedebab2f7b5ca0331e325602d

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