Malicious PDF — malware analysis report

Static analysis result for SHA-256 18eab1af1bf2b28f…

MALICIOUS

PDF

48.2 KB Created: 2021-06-09 16:15:54 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 715a5e11bbd86c9e8411c6eb5da4cbad SHA-1: beee47d9aa1d805926628a04d57637009016d1a7 SHA-256: 18eab1af1bf2b28f9d9031f5a38ec17dfed565325fa7423c5b34684eabfac018
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links that redirect to malicious infrastructure, specifically promoting 'game hacks' and 'free generators' for popular games. The ML classifier strongly flagged this PDF as malicious, and the presence of redirector links indicates a phishing or scam attempt. Although no scripts were extracted, the document's structure and embedded URLs are indicative of a social engineering attack designed to lead users to potentially harmful websites.

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.tw/app/431946152/ho-to-get-free-hair-on-roblox-game-hack In PDF document text
    • http://muslib.unmus.ac.id/repository/hack-coin-master-online-without-human-verification_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/free-coin-master-spin-app_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/roblox-hack-ga_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/free-roblox-girl-clothes_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/coin-master-free-spins-hack-ios_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/free-minecraft-coins_GM479516143.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/easy-robux-hack_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/how-do-you-get-free-robux-without-doing-anything_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/boost9-com-roblox-hack_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/how-to-hack-someones-roblox-account-2021_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/free-robux-sans-verification-humaine_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/free-robux-scams_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/pubg-uc-100_GM1330123889.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/how-to-get-anything-for-free-on-roblox-2021-inspect_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/coin-master-free-spins-link-today_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/get-minecraft-windows-10-free_GM479516143.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/tiktok-free-play-online_GM835599320.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/how-do-you-hack-minecraft_GM479516143.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/krnl-roblox_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/roblox-hack-tool_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
stream_004_off0000535d.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x535D 25896 bytes
SHA-256: 947f1b4ce69c00402ecdcdbaf5e85d71a0dc7165997caa0bd0956f89a9647bbc
font_01_sfnt_off00008f4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8F4C 2816 bytes
SHA-256: 4555740682277f0055d57b15bd0ba953e5b51415ea3d21c93db391eace072d4f
font_02_sfnt_off0000995d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x995D 18400 bytes
SHA-256: fc58e99de831ea755418a23d7f1096d0177e5c5a1221618a2ff13888134e4665

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