Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f68148ace6ee179…

MALICIOUS

PDF

33.7 KB Created: 2021-07-07 23:50:31 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 0ab89826d9649215c4e25b44d54dfdc3 SHA-1: 1c6afbdd24c7e54486600a1a61ad7bd5981e5a59 SHA-256: 4f68148ace6ee1793f9aad50a8b0de97a19aaacb0e9abc14747e0527956601f7
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains embedded links that redirect to malicious infrastructure, specifically promoting 'free generator / game hack' lures. The document body and extracted URLs strongly suggest a phishing or scam attempt designed to trick users into visiting potentially harmful websites. No scripts were extracted, but the presence of malicious redirector links and the ML classifier output indicate a high likelihood of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://netcdn.tw/app/431946152/free-roblox-generator-game-hack In PDF document text
    • http://elib.upiyptk.ac.id/opac/repository/robux-get-com_GM431946152.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac/repository/100-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac/repository/claimrobux-net_GM431946152.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac/repository/roblox-elemental-wars-hack-script_GM431946152.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac/repository/robloxfun-com-generator_GM431946152.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac/repository/how-do-you-hack-roblox_GM431946152.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac/repository/minecraft-toys-for-free_GM479516143.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac/repository/roblox-card-2021-652021-free_GM431946152.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac//repository/how-can-you-get-free-robux_GM431946152.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac//repository/coin-master-hack-ios-cydia_GM406889139.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac/repository/how-to-get-free-robux-no-human-survey_GM431946152.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac/repository/free-robux-link_GM431946152.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac//repository/hack-download_GM431946152.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac/repository/how-to-get-free-robux-no-verification_GM431946152.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac/repository/free-robux-2021-october_GM431946152.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac/repository/how-to-get-free-robux-codes-2021_GM431946152.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac/repository/roblox-my-girlfriend-cheated-on-me_GM431946152.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac//repository/minecraft-font-free_GM479516143.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac//repository/coinmasterfreespinlink_GM406889139.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac/repository/minecraft-coins-free_GM479516143.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
font_00_sfnt_off00002d9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2D9B 22268 bytes
SHA-256: e3fa6df2daa29a600e128d88162119e8f4b018430760615222f9b4093b344f85
font_01_sfnt_off00005f2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5F2D 18752 bytes
SHA-256: 7a858cebcbb43583261fc6928f7757faac90e9e6cc2d406a534a148fe309e18e

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