Malicious PDF — malware analysis report

Static analysis result for SHA-256 56f5c1c6836e3a22…

MALICIOUS

PDF

35.0 KB Created: 2021-07-08 00:43:29 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 218322f9261b468f14e8194fd329a2dc SHA-1: ca90c26cda22316694ea7fc29f52a60f03152782 SHA-256: 56f5c1c6836e3a22ea5141c4ebd24006cd2e7af7ea546da01b2e2ec1fd146551
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external sites, many of which are part of a link farm designed to attract users searching for game hacks and cheats. The primary redirector URL, http://netcdn.tw/app/406889139/coin-master-app-free-download-game-hack, is flagged as malicious. The document body and heuristics indicate a lure for game-related exploits, likely leading to further malicious content or malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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-app-free-download-game-hack In PDF document text
    • https://library.sttbandung.ac.id/repository/pokemon-go-free-joystick-hack_GM1094591345.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/hire-someone-to-hack-a-roblox-account_GM431946152.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/hack-coin-master-free_GM406889139.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/free-spins-on-coin-master-link_GM406889139.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/can-you-give-me-free-robux_GM431946152.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/daily-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/roblox-animation-free_GM431946152.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/free-robux-by-watching-ads_GM431946152.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/free-roblox-accounts-with-robux-that-work-not-banned-2021_GM431946152.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/free-spin-link-in-coin-master_GM406889139.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/how-to-make-your-own-dominus-in-roblox-free_GM431946152.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/pubg-uc-180_GM1330123889.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/free-robux-exe_GM431946152.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/roblox-www-com_GM431946152.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/hack-to-get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/how-to-hack-roblox-accounts-2021-easy_GM431946152.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/how-to-get-free-faces-on-roblox-november_GM431946152.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/coin-master-50-spin-link_GM406889139.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/free-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/microsoft-bing-free-robux_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_off000030c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x30C9 23112 bytes
SHA-256: b968f9686f1dd57152068e33111e0a61aaebb9817fd8c88d86605ab15a2c0d15
font_01_sfnt_off000064de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x64DE 18756 bytes
SHA-256: 18b381f39c1f2fc92fdb5c80f0a2eef4a5e540a337f753dcb506902869b90e64

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