Malicious PDF — malware analysis report

Static analysis result for SHA-256 61bfeb65da6f63a1…

MALICIOUS

PDF

51.3 KB Created: 2021-06-03 21:43:11 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-22
MD5: a769c4f818b5a55b8ed3df5431a1be56 SHA-1: 2fd3405214b6a825e97744c58b44bf5ccd6b3734 SHA-256: 61bfeb65da6f63a173f643700028df33a65430b0545c04f3e004594a5447a643
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple embedded links that redirect to malicious infrastructure, specifically promoting 'free generator / game hack' lures. The document body, though partially obfuscated, contains text and URLs consistent with a social engineering lure designed to trick users into visiting potentially harmful websites. No scripts were extracted, but the presence of malicious redirector links and the ML classifier's high confidence score indicate a high likelihood of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9685

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/free-coin-master-spins-2021-game-hack In PDF document text
    • http://perpus.fisip.unnur.ac.id/repository/free-robux-quiz_GM431946152.pdfIn PDF document text
    • http://perpus.fisip.unnur.ac.id/repository/80-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://perpus.fisip.unnur.ac.id/repository/today-free-spin-coin-master_GM406889139.pdfIn PDF document text
    • http://perpus.fisip.unnur.ac.id/repository/free-coins-and-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://perpus.fisip.unnur.ac.id/repository/coin-master-link-for-spins_GM406889139.pdfIn PDF document text
    • http://perpus.fisip.unnur.ac.id/repository/free-coins-coin-master_GM406889139.pdfIn PDF document text
    • http://perpus.fisip.unnur.ac.id/repository/get-free-robux-today_GM431946152.pdfIn PDF document text
    • http://perpus.fisip.unnur.ac.id/repository/roblox-hack-download_GM431946152.pdfIn PDF document text
    • http://perpus.fisip.unnur.ac.id/repository/free-coins-coin-master-link-2021_GM406889139.pdfIn PDF document text
    • http://perpus.fisip.unnur.ac.id/repository/free-robux-no-human-verify_GM431946152.pdfIn PDF document text
    • http://perpus.fisip.unnur.ac.id/repository/how-to-get-roblox-premium-for-free_GM431946152.pdfIn PDF document text
    • http://perpus.fisip.unnur.ac.id/repository/coin-master-free-coins-2021_GM406889139.pdfIn PDF document text
    • http://perpus.fisip.unnur.ac.id/repository/are-pubg-uc-available_GM1330123889.pdfIn PDF document text
    • http://perpus.fisip.unnur.ac.id/repository/free-robux-accounts-2021_GM431946152.pdfIn PDF document text
    • http://perpus.fisip.unnur.ac.id/repository/can-u-get-free-robux_GM431946152.pdfIn PDF document text
    • http://perpus.fisip.unnur.ac.id/repository/free-robux-only-username-no-human-verification_GM431946152.pdfIn PDF document text
    • http://perpus.fisip.unnur.ac.id/repository/roblox-no-download-hack_GM431946152.pdfIn PDF document text
    • http://perpus.fisip.unnur.ac.id/repository/how-to-get-infinite-robux_GM431946152.pdfIn PDF document text
    • http://perpus.fisip.unnur.ac.id/repository/free-robux-today_GM431946152.pdfIn PDF document text
    • http://perpus.fisip.unnur.ac.id/repository/aimbot-exe-roblox_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00005523.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5523 24852 bytes
SHA-256: 2883614e7399cbd10e633c2720d16e3c4b54ff635d734f144dd67f6eabce5b63
font_01_sfnt_off00008dd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8DD0 4028 bytes
SHA-256: 6a4891da4f8b73c02e22ecd6fa566d6bb4f5f2d5575b30a343f3d3c5e0919267
font_02_sfnt_off00009b72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9B72 2788 bytes
SHA-256: 6fd7c7f447d66842f81aa8cf197935b17f22157d0c7e9f95622df1b5b4ddf530
font_03_sfnt_off0000a561.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA561 18288 bytes
SHA-256: cbf21fc5c11f74798808ab0cc71af5e4bf323ced5a050f8983f0748b8c809d88

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