Malicious PDF — malware analysis report

Static analysis result for SHA-256 22412d3ef53dfd7c…

MALICIOUS

PDF

47.5 KB Created: 2021-05-11 03:18:43 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-26
MD5: c057cedc82f1488750e939eb437c7cd5 SHA-1: 208575f0be2d77e431abe9d7d84ba3ef76b7fd5f SHA-256: 22412d3ef53dfd7c2813b9a73aa1a706ae0cd30f2d55025533d9aac2819c713e
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains multiple links to external websites, including a known malicious redirector, masquerading as free game hacks and generators. The ML classifier also flagged this PDF as malicious. The embedded URLs are designed to lure users into clicking them, likely leading to further malicious content or downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8715

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/479516143/is-minecraft-education-edition-free-game-hack In PDF document text
    • http://www.nfca.org.tw/upload/files/master-free-spin_GM406889139.pdfIn PDF document text
    • http://www.nfca.org.tw/upload/files/coin-master-free-spins-hack-no-human-verification_GM406889139.pdfIn PDF document text
    • http://www.nfca.org.tw/upload/files/free-roblox-website_GM431946152.pdfIn PDF document text
    • http://www.nfca.org.tw/upload/files/100-free-coin-master-spins_GM406889139.pdfIn PDF document text
    • http://www.nfca.org.tw/upload/files/how-to-hack-robux_GM431946152.pdfIn PDF document text
    • http://www.nfca.org.tw/upload/files/free-robux-hacks-no-verification_GM431946152.pdfIn PDF document text
    • http://www.nfca.org.tw/upload/files/roblox-hacked-accounts-list_GM431946152.pdfIn PDF document text
    • http://www.nfca.org.tw/upload/files/free-roblox-glasses_GM431946152.pdfIn PDF document text
    • http://www.nfca.org.tw/upload/files/how-to-get-free-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://www.nfca.org.tw/upload/files/free-robux-no-downloading-apps_GM431946152.pdfIn PDF document text
    • http://www.nfca.org.tw/upload/files/free-robux-no-anti-bot-verification_GM431946152.pdfIn PDF document text
    • http://www.nfca.org.tw/upload/files/free-robux-2021_GM431946152.pdfIn PDF document text
    • http://www.nfca.org.tw/upload/files/mcpe-free-download_GM479516143.pdfIn PDF document text
    • http://www.nfca.org.tw/upload/files/mobihack-roblox-hack_GM431946152.pdfIn PDF document text
    • http://www.nfca.org.tw/upload/files/coin-master-get-free-spins_GM406889139.pdfIn PDF document text
    • http://www.nfca.org.tw/upload/files/hack-coin-master-343-apk_GM406889139.pdfIn PDF document text
    • http://www.nfca.org.tw/upload/files/free-robux-for-free_GM431946152.pdfIn PDF document text
    • http://www.nfca.org.tw/upload/files/rbx-earn_GM431946152.pdfIn PDF document text
    • http://www.nfca.org.tw/upload/files/coin-master-free-spins-daily-fb-champion_GM406889139.pdfIn PDF document text
    • http://www.nfca.org.tw/upload/files/roblox-arsenal-hack_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004ae0.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4AE0 25100 bytes
SHA-256: 50dac5474191dea5a3182b5cf94f25eafa8e1b81f49ea94f597c16572e7782e0
font_01_sfnt_off00008351.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8351 3020 bytes
SHA-256: f1a29adcea636583330be8db4f6466410de551ac48576b9e1aa5c34e2d665a1f
font_02_sfnt_off00008da5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8DA5 2816 bytes
SHA-256: 4555740682277f0055d57b15bd0ba953e5b51415ea3d21c93db391eace072d4f
font_03_sfnt_off000097b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x97B5 18024 bytes
SHA-256: 860599eb2378c11ce9f069b8b1214934614c40beead093e3b25ec1c42f286d72

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