Malicious PDF — malware analysis report

Static analysis result for SHA-256 951a91420ba3741c…

MALICIOUS

PDF

34.6 KB Created: 2021-07-02 07:43:36 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 2915f90824326b0d036ddc2fa4ab2ef5 SHA-1: 60bd6befd250dacb7d0702d6f86446f73ac87242 SHA-256: 951a91420ba3741c5599b45f149009d02efc5e8abb3eb18773ef4cf6c9468d38
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document is designed as a lure, using the promise of free in-game items for Roblox and Coin Master to trick users into clicking a link. The primary link, http://netcdn.co/app/431946152/free-red-shirt-in-roblox-game-hack, is identified as a malicious redirector. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest a phishing or malware distribution attempt, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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.co/app/431946152/free-red-shirt-in-roblox-game-hack In PDF document text
    • https://digilib.stimlog.ac.id/repository/flame-gg-free-robux_GM431946152.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/how-to-get-free-robux-for-real_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/roblox-free-boombox-script-site-v3rmillionnet_GM431946152.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/cheating-hacks-for-coin-master_GM406889139.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/roblox-ps4-free_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/coin-master-free-spin-and-coin_GM406889139.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/free-roblox-accounts-with-robux-2021-june_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/joshy-roblox-hack-virus_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/how-you-get-free-robux_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/roblox-speed-hack-pastebin_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/how-to-get-infinite-health-in-roblox-with-cheat-engine_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/hack-roblox-jailbreack_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/cool-roblox-avatar-free_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/roblox-ro-ghoul-cheat-rc_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/roblox-items-that-hack-your-game_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/roblox-cheat-generator-free-download_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/roblox-free-hood_GM431946152.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/free-daily-spin-coin-master-game_GM406889139.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/roblox-skirt-free-to-take_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/minecraft-java-edition-code-free_GM479516143.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_off0000301b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x301B 22384 bytes
SHA-256: be8c252b2b945c26070f8fbf52f5d01ced4b0c15e4c48ace26b7401f6149fb62
font_01_sfnt_off0000619b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x619B 19216 bytes
SHA-256: 237d146b626cdd47d9bc0b28e9a58fe1cffe7cfb5f8e76c02f6f5631ee798d76

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