Malicious PDF — malware analysis report

Static analysis result for SHA-256 5757ab093eeac9ba…

MALICIOUS

PDF

48.3 KB Created: 2021-06-03 04:57:45 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 9c1ce6d54d0ed3022796106700c1473a SHA-1: eeebe529be878f082de17bec69eeb8a24da7779e SHA-256: 5757ab093eeac9baa67f0dc6971754d23b8aad5ef9464708de57f4244f431470
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a lure for free game currency, directing users to a known malicious redirector URL. The document body and embedded artifacts are heavily obfuscated, but the primary heuristic firings indicate a redirection to malicious infrastructure. The ML classifier also flagged this PDF with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9796

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/totally-free-coin-master-spins-2021-game-hack In PDF document text
    • http://library.umla.ac.id/repository/minecraft-pocket-apk_GM479516143.pdfIn PDF document text
    • http://library.umla.ac.id/repository/free-minecraft-website_GM479516143.pdfIn PDF document text
    • http://library.umla.ac.id/repository/free-coins-coin-master-today_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id//repository/roblox-free-robux-no-verification_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id/repository/coin-master-free-attack_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id//repository/how-to-create-group-in-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id//repository/free-coin-master-spins-2021_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id/repository/easy-how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id/repository/best-free-spin-app-for-coin-master_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id/repository/you-promised-my-son-free-robux_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id//repository/minecraft-xbox-one-free_GM479516143.pdfIn PDF document text
    • http://library.umla.ac.id//repository/roblox-com-www_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id//repository/coin-master-hack-online-cheat_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id/repository/bloxpage-free-robux_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id//repository/free-robux-on-ipad_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id//repository/coin-master-daily-spin-free_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id//repository/do-you-get-windows-10-minecraft-for-free-with-java_GM479516143.pdfIn PDF document text
    • http://library.umla.ac.id//repository/microsoft-store-robux_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id/repository/coin-master-hack-generator-tool_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id//repository/coin-mast-hacks_GM406889139.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_off00005332.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5332 24844 bytes
SHA-256: 8939ebdde0dbf10bab9c379419cee2888f11d9161a0611d6cc7ce277243c2a79
font_01_sfnt_off00008bc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8BC2 4020 bytes
SHA-256: 7d3617ecf51e14e6cffc9372c4441988c3b6cb3ea010f7512aee6af842ef388d
font_02_sfnt_off0000994d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x994D 18544 bytes
SHA-256: 3a7398ea0336b45035fff825b820f06316ae3708075cb47f3d8a56e5b6d51e0f

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