Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f127fbfa83b96e8…

MALICIOUS

PDF

37.7 KB Created: 2021-07-08 05:10:54 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-27
MD5: ba25388aa435db313919295fac92c301 SHA-1: 12eac588b85a054643fc62021500f4f0f68517c6 SHA-256: 9f127fbfa83b96e8f5b14e6d24b3bb5747c806e73e12533130128dc147229d5f
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to a known malicious redirector, specifically advertising 'Coin Master Free Spin Daily Link' and 'game hack' generators. The ML classifier also flagged this PDF as malicious. The primary lure appears to be a scam related to popular mobile games, aiming to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9886

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/406889139/coin-master-free-spin-daily-link-game-hack In PDF document text
    • http://perpustakaan.idia.ac.id/repository/free-robux-december-2021_GM431946152.pdfIn PDF document text
    • http://perpustakaan.idia.ac.id/repository/coin-master-hack-apk-android-1_GM406889139.pdfIn PDF document text
    • http://perpustakaan.idia.ac.id/repository/roblox-toys-codes-free-2021_GM431946152.pdfIn PDF document text
    • http://perpustakaan.idia.ac.id/repository/free-robux-pastebin_GM431946152.pdfIn PDF document text
    • http://perpustakaan.idia.ac.id/repository/free-coins-and-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://perpustakaan.idia.ac.id/repository/free-online-roblox-games-no-download_GM431946152.pdfIn PDF document text
    • http://perpustakaan.idia.ac.id/repository/how-to-change-your-name-on-roblox-for-free_GM431946152.pdfIn PDF document text
    • http://perpustakaan.idia.ac.id/repository/minecraft-download-free-download_GM479516143.pdfIn PDF document text
    • http://perpustakaan.idia.ac.id/repository/how-to-get-free-roblox-money_GM431946152.pdfIn PDF document text
    • http://perpustakaan.idia.ac.id/repository/free-robux-clothes_GM431946152.pdfIn PDF document text
    • http://perpustakaan.idia.ac.id/repository/minecraft-free-download-mac-full-version-2021_GM479516143.pdfIn PDF document text
    • http://perpustakaan.idia.ac.id/repository/roblox-sexually_GM431946152.pdfIn PDF document text
    • http://perpustakaan.idia.ac.id/repository/free-coin-master-spins-blog_GM406889139.pdfIn PDF document text
    • http://perpustakaan.idia.ac.id/repository/get-free-robux-at_GM431946152.pdfIn PDF document text
    • http://perpustakaan.idia.ac.id/repository/coin-master-free-spins-for-today_GM406889139.pdfIn PDF document text
    • http://perpustakaan.idia.ac.id/repository/free-minecraft-server-hosting-24-7_GM479516143.pdfIn PDF document text
    • http://perpustakaan.idia.ac.id/repository/how-to-get-free-robux-on-pc_GM431946152.pdfIn PDF document text
    • http://perpustakaan.idia.ac.id/repository/coinmaster-com_GM406889139.pdfIn PDF document text
    • http://perpustakaan.idia.ac.id/repository/hacks-para-roblox_GM431946152.pdfIn PDF document text
    • http://perpustakaan.idia.ac.id/repository/tiktok-free-views-2021_GM835599320.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
font_00_sfnt_off000032aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x32AA 22608 bytes
SHA-256: 861756c260f2e77d9dd4e818f16cc9e5e755fb8ae85cb84227edc03527fc57b8
font_01_sfnt_off0000653c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x653C 2896 bytes
SHA-256: c1a618813a64314343402b2ec738fc11c4c912460a4c7ae3029924d2f9a229cd
font_02_sfnt_off00006f21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6F21 18768 bytes
SHA-256: 9fefbb771085525faa6b6b1c9c948570a810338fb9e41354c9418806dfb9931a

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