Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a121bdf7937b534…

MALICIOUS

PDF

49.1 KB Created: 2021-06-04 00:58:51 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: e706e6a2639ebee0d15cb0cbc39f2731 SHA-1: 8677eff4c57acd4029e7c23a410f8d42cfe4410f SHA-256: 7a121bdf7937b53416bd2a8ecc650f2c1d2cd488b69f5b85d6050809bff3e1b5
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 what appear to be game hacks or generators. The primary malicious URL identified is https://netcdn.online/app/431946152/games-that-give-you-free-robux-game-hack, which is flagged as a known malicious redirector. The document body and embedded links suggest a phishing or scam attempt to drive traffic to potentially harmful content. No scripts were extracted, but the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9796

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/games-that-give-you-free-robux-game-hack In PDF document text
    • http://library.yamasi.ac.id/repository/coin-master-hack-mod-apk-2021-download_GM406889139.pdfIn PDF document text
    • http://library.yamasi.ac.id//repository/free-spins-coin-master-2021-no-verification_GM406889139.pdfIn PDF document text
    • http://library.yamasi.ac.id//repository/free-stuff-on-roblox_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id//repository/robux-generator-2021_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id//repository/minecraft-free-play-no-download_GM479516143.pdfIn PDF document text
    • http://library.yamasi.ac.id//repository/coin-master-free-spins-link_GM406889139.pdfIn PDF document text
    • http://library.yamasi.ac.id//repository/free-spins-for-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/free-robux-generator-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/free-spins-coin-master-2021-today_GM406889139.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/roblox-free-robux_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/how-to-make-your-own-minecraft-pe-server-for-free_GM479516143.pdfIn PDF document text
    • http://library.yamasi.ac.id//repository/free-multiplayer-minecraft-server_GM479516143.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/coin-master-free-cards-hack_GM406889139.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/minecraft-free-app_GM479516143.pdfIn PDF document text
    • http://library.yamasi.ac.id//repository/download-minecraft-free-hiapphere_GM479516143.pdfIn PDF document text
    • http://library.yamasi.ac.id//repository/coin-master-free-daily-spins-link_GM406889139.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/coin-master-hack-tool-india_GM406889139.pdfIn PDF document text
    • http://library.yamasi.ac.id//repository/free-robux-obby_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id//repository/coin-master-free-spins-and-coins-without-human-verification_GM406889139.pdfIn PDF document text
    • http://library.yamasi.ac.id//repository/free-robux-generator-no-human-verification-or-survey-2021_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
font_00_sfnt_off0000513b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x513B 26840 bytes
SHA-256: 50d3ab0422f2db68a7ef6bf3498287a6329b14c5503c7263a43c6f1d0cecd53b
font_01_sfnt_off00008d7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8D7C 5696 bytes
SHA-256: 450e3ee45915afe13702bf1d587eb8b9ad88a8d2113419ac9f2fd116a828e139
font_02_sfnt_off00009a8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9A8E 19168 bytes
SHA-256: c4d6735542cd49b50f18b2921f89e54fe5d8ee4af3f47c61005942af246faebd

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