Malicious PDF — malware analysis report

Static analysis result for SHA-256 45d31019d0b327c3…

MALICIOUS

PDF

44.3 KB Created: 2021-06-03 13:14:49 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-23
MD5: f70e9ad94bd070c31662ede79f765a46 SHA-1: 76518c160e270e508c70c46f6892a2523c6ca083 SHA-256: 45d31019d0b327c3905196d7e7215dd902a5a371675208561f3377679f6fa169
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded links that redirect to known malicious infrastructure, specifically promoting "game hacks" and "free spins". The document body, though obfuscated, contains URLs that are consistent with this lure. The primary attack pattern involves tricking the user into visiting a malicious site via a deceptive link, likely leading to further malware download or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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 https://netcdn.online/app/406889139/how-to-get-free-spins-on-coin-master-android-game-hack In PDF document text
    • http://pustaka1.unindra.id/repository/hack-coin-master-for-free_GM406889139.pdfIn PDF document text
    • http://pustaka1.unindra.id/repository/free-robux-obby_GM431946152.pdfIn PDF document text
    • http://pustaka1.unindra.id/repository/boost9-com-roblox-hack_GM431946152.pdfIn PDF document text
    • http://pustaka1.unindra.id/repository/spins-gratis-coin-master-hoy_GM406889139.pdfIn PDF document text
    • http://pustaka1.unindra.id/repository/get-2021-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://pustaka1.unindra.id/repository/free-minecraft-account-generator_GM479516143.pdfIn PDF document text
    • http://pustaka1.unindra.id/repository/free-robux-obby-2021_GM431946152.pdfIn PDF document text
    • http://pustaka1.unindra.id/repository/coin-master-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • http://pustaka1.unindra.id/repository/how-to-hack-coins-in-archery-master-3d_GM406889139.pdfIn PDF document text
    • http://pustaka1.unindra.id/repository/free-robux-stream_GM431946152.pdfIn PDF document text
    • http://pustaka1.unindra.id/repository/flame-gg-free-robux_GM431946152.pdfIn PDF document text
    • http://pustaka1.unindra.id/repository/free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://pustaka1.unindra.id/repository/links-to-get-free-coins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://pustaka1.unindra.id/repository/coin-master-hack-without-human-verification-2021_GM406889139.pdfIn PDF document text
    • http://pustaka1.unindra.id/repository/coin-master-free-spin-and-coins-fbid-links_GM406889139.pdfIn PDF document text
    • http://pustaka1.unindra.id/repository/minecraft-pe-apk-download_GM479516143.pdfIn PDF document text
    • http://pustaka1.unindra.id/repository/minecraft-survival-hacks_GM479516143.pdfIn PDF document text
    • http://pustaka1.unindra.id/repository/coin-master-hack-ios-2021_GM406889139.pdfIn PDF document text
    • http://pustaka1.unindra.id/repository/how-to-get-free-robux-app_GM431946152.pdfIn PDF document text
    • http://pustaka1.unindra.id/repository/robux-scam_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
stream_004_off000050b9.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x50B9 25856 bytes
SHA-256: f681f49930540f96a6f422a07900af290f09f1a8ad9e2f319b912c7f524720da
font_01_sfnt_off00008ac0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8AC0 18224 bytes
SHA-256: e75a85775560c8380404af7b38c0f71a56f3669257afdef98786fb98fd154819

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