Malicious PDF — malware analysis report

Static analysis result for SHA-256 aaf99cac3edfeca0…

MALICIOUS

PDF

52.5 KB Created: 2021-06-09 05:03:48 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-21
MD5: b12b788faf3e3d655214e03320d8415e SHA-1: c56c91d2c0e9390355b2a6cbfd4ff12994d4d5fd SHA-256: aaf99cac3edfeca0b074e5e546ff03f5e4be2532888b9646709f0e8590e60887
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document employs a lure related to game hacking to entice users into clicking a link. The primary link, https://netcdn.tw/app/431946152/how-to-hack-roblox-accounts-passwords-2021-game-hack, is identified as a malicious redirector. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect users to malicious websites, likely for further exploitation or phishing. The ML classifier also flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9586

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.tw/app/431946152/how-to-hack-roblox-accounts-passwords-2021-game-hack In PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/free-roblox-gfx-maker_GM431946152.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/minecraft-java-edition-for-free_GM479516143.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id//repository/free-robux-wheel_GM431946152.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id//repository/earn-free-robux-for-roblox_GM431946152.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/roblox-data-breach_GM431946152.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id//repository/oprewards-com-roblox_GM431946152.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id//repository/robux-free-gift-card_GM431946152.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/how-do-you-get-free-roblox-money_GM431946152.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/coin-master-hacks-no-human-verification_GM406889139.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id//repository/coin-master-free-coins-and-spins-daily_GM406889139.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/free-roblox-hack_GM431946152.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id//repository/minecraft-free-minecoins_GM479516143.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/free-stuff-on-roblox-2021_GM431946152.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/roblox-free-login_GM431946152.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/free-spins-and-coins-coin-master_GM406889139.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id//repository/pubg-uc-20219_GM1330123889.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/roblox-is-getting-hacked_GM431946152.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/reddit-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/free-coins-and-spins-2021_GM406889139.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id//repository/coin-master-rewards-free-spins_GM406889139.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_off0000539e.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x539E 29480 bytes
SHA-256: a2d0a62b7cdd8d152bf540c32132b4099c154c89e4855ea49edc28169516d046
font_01_sfnt_off00009592.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9592 7448 bytes
SHA-256: a76ff9b4805dcff342f7268a16e2e3c2ff2b31b96c381fe4deb6ceea777bce90
font_02_sfnt_off0000a774.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA774 19320 bytes
SHA-256: 03c727be2ab1f0e579d85015c38ad6ed749fb08f69900a53b9deacb29b8bce2f

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