Malicious PDF — malware analysis report

Static analysis result for SHA-256 48d8b1e9268e35cd…

MALICIOUS

PDF

48.0 KB Created: 2021-06-03 09:02:53 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 695d41e0d22160defa23019c9fb4fa96 SHA-1: c9266aa4492e625079ddc9496b21b5181236ea1d SHA-256: 48d8b1e9268e35cd8c2787a2ea32138f3c769496adf4c82ead2449b04e29e89c
260 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains multiple links to redirectors and SEO spam sites, with a primary lure for "free Robux" or "game hacks". The document body, though partially corrupted, contains a URL that matches the critical heuristic findings. The presence of a visual download button and instructions for a password-protected archive suggest a multi-stage attack designed to bypass security controls.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9796

Heuristics 6

  • 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.online/app/431946152/free-robux-without-verification-game-hack In PDF document text
    • http://www.library.umbjm.ac.id/repository/how-to-hack-roblox-to-get-robux_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/how-do-you-hack-roblox_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/minecraft-18-9-hacked-client_GM479516143.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/real-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/roblox-free-play-no-download_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/free-coins-for-coin-master-blogger_GM406889139.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/how-to-get-roblox-money_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/hack-my-game-xyz-coin-master_GM406889139.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/coin-master-jackpot-hack_GM406889139.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/com-roblox_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/what-games-give-you-robux_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/pokemon-go-free-team-medallion_GM1094591345.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/hacks-para-roblox_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/best-way-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/plug-toolbox-for-minecraft-free-ios_GM479516143.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/coin-master-free-spins-2021-ios_GM406889139.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/free-robux-for-kids_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/free-spin-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/coin-master-free-spins-that-really_GM406889139.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/free-roblox-usernames-and-passwords_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_off00005102.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5102 27144 bytes
SHA-256: 50b77bc50a28506990fa3fbde04beffb4ccc6af7a0bd79ead7b300e8fa392669
font_01_sfnt_off00008d19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8D19 2880 bytes
SHA-256: b053084cafd01c649462d87667ba56c569d6480ce60e7d20ae57ef6124cf178e
font_02_sfnt_off00009704.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9704 18964 bytes
SHA-256: 5864977637737ef4e1bd5b7bfc66e5602b8aa3d3ed60f74fb5f96fd63c3aa8ef

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