Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d2c60c7d15618e4…

MALICIOUS

PDF

47.0 KB Created: 2021-06-11 12:17:42 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 056dbc8516cb29e1a932011e30e77f2d SHA-1: cdc56c9a568b99b29593642223f4141ee6984977 SHA-256: 6d2c60c7d15618e4d6808a1e198d94ecce3ae144ef691a8a5e153013822e1afc
200 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document employs a fake CAPTCHA lure to trick users into clicking embedded links, which are identified as malicious redirectors. The primary malicious link, 'https://netcdn.tw/app/431946152/free-roblox-app-how-to-delete-game-hack', leads to further redirection. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest an attempt to deliver a malicious payload or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9769

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.
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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.tw/app/431946152/free-roblox-app-how-to-delete-game-hack In PDF document text
    • https://pn-tapaktuan.go.id/pustaka/repository/how-to-hack-roblox-on-mobile_GM431946152.pdfIn PDF document text
    • https://pn-tapaktuan.go.id/pustaka/repository/how-to-change-your-username-on-roblox-for-free_GM431946152.pdfIn PDF document text
    • https://pn-tapaktuan.go.id/pustaka/repository/minecraft-online-free-download_GM479516143.pdfIn PDF document text
    • https://pn-tapaktuan.go.id/pustaka/repository/roblox-apocalypse-rising-hack_GM431946152.pdfIn PDF document text
    • https://pn-tapaktuan.go.id/pustaka/repository/how-to-hack-coin-master-using-es-filer_GM406889139.pdfIn PDF document text
    • https://pn-tapaktuan.go.id/pustaka/repository/minecraft-life-hacks_GM479516143.pdfIn PDF document text
    • https://pn-tapaktuan.go.id/pustaka/repository/minecraft-hacks_GM479516143.pdfIn PDF document text
    • https://pn-tapaktuan.go.id/pustaka/repository/how-to-get-roblox-money_GM431946152.pdfIn PDF document text
    • https://pn-tapaktuan.go.id/pustaka/repository/free-robux-generator-no-human-verification_GM431946152.pdfIn PDF document text
    • https://pn-tapaktuan.go.id/pustaka/repository/free-minecraft-wallpaper_GM479516143.pdfIn PDF document text
    • https://pn-tapaktuan.go.id/pustaka/repository/coin-master-free-spin-link-today-download_GM406889139.pdfIn PDF document text
    • https://pn-tapaktuan.go.id/pustaka/repository/roblox-devil_GM431946152.pdfIn PDF document text
    • https://pn-tapaktuan.go.id/pustaka/repository/free-robux-discord_GM431946152.pdfIn PDF document text
    • https://pn-tapaktuan.go.id/pustaka/repository/free-coin-coin-master_GM406889139.pdfIn PDF document text
    • https://pn-tapaktuan.go.id/pustaka/repository/www-coinmaster-com_GM406889139.pdfIn PDF document text
    • https://pn-tapaktuan.go.id/pustaka/repository/links-to-get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://pn-tapaktuan.go.id/pustaka/repository/how-to-get-minecraft-pe-for-free_GM479516143.pdfIn PDF document text
    • https://pn-tapaktuan.go.id/pustaka/repository/wurst-115-2_GM479516143.pdfIn PDF document text
    • https://pn-tapaktuan.go.id/pustaka/repository/free-robux-without-human-verification-real_GM431946152.pdfIn PDF document text
    • https://pn-tapaktuan.go.id/pustaka/repository/roblox-games-with-free-vip-servers_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0000525d.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x525D 24732 bytes
SHA-256: 055ae7dd93f057f786116feceb05337047349c32f60b72bdd118a50a85ce2644
font_01_sfnt_off00008a48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8A48 2888 bytes
SHA-256: dcdd98ee8e25436a83587ccb4027347dd2c3fcec95f3413942edd4086125bcca
font_02_sfnt_off0000941c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x941C 18560 bytes
SHA-256: d6e60e65621555c13ca5ebd3a81a70f05e954ab211a4677f49775df5de30690c

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