Malicious PDF — malware analysis report

Static analysis result for SHA-256 953b2a857105ace6…

MALICIOUS

PDF

46.1 KB Created: 2021-06-04 03:53:45 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 4bea7d612295b2f74d996f73d32d672d SHA-1: 636dfe4da0c7e50648bf7fc556b3022006f26ac4 SHA-256: 953b2a857105ace640934340c6127f00a8139b5386fdb174c371c13133a16db4
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains multiple links designed to lure users into clicking on them by promising game hacks and free currency. The primary link leads to a known malicious redirector infrastructure. The document body, though heavily obfuscated, contains references to 'free robux' and 'game hack', reinforcing the lure. The presence of numerous external PDF links suggests a link farm or SEO poisoning tactic to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9797

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 https://netcdn.online/app/431946152/blox-fish-free-robux-game-hack In PDF document text
    • http://www.library.umbjm.ac.id/repository/real-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/free-spins_GM406889139.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/how-to-hack-roblox-on-mobile_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/coin-master-free-spin-link-today-50_GM406889139.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/bloxpink-free-robux_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/is-there-a-way-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/how-to-get-hacks-on-minecraft_GM479516143.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/coin-master-free-shield-link_GM406889139.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/coin-master-free-online-game_GM406889139.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/minecraft-images-free_GM479516143.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/free-hair-roblox_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/how-to-get-minecraft-for-free-on-pc_GM479516143.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/free-robux-without-any-verification_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/2021-free-coin-master-spins_GM406889139.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/how-to-win-free-robux_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/how-to-hack-peoples-roblox-accounts_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/coin-master-hack-apk-online_GM406889139.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/free-spins-on-coin-master-iphone_GM406889139.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/free-minecraft-survival-server_GM479516143.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/games-on-roblox-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • http://wolfzscriptsIn 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_off00004f2f.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4F2F 24852 bytes
SHA-256: b56d4882c2e80d7540278b83734d3f19cf34a65bd11b435450deed865f89c8fb
font_01_sfnt_off0000875a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x875A 2832 bytes
SHA-256: 78e89c8f621d90011ffb7a2107d701d4cdf090a2f2cf42d5a65297289afc8805
font_02_sfnt_off0000910a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x910A 18376 bytes
SHA-256: 833bfe47d36e77ffff594e1188eeee77c72f4d78f65cd820fb361f10e8c51563

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