Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e9620d87c8e6595…

MALICIOUS

PDF

34.9 KB Created: 2021-07-03 12:53:08 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 39445fb959a9518d12f3c4594989fb69 SHA-1: e2155d9cdea898f46f963be357bbcaf025c45505 SHA-256: 1e9620d87c8e6595f704258ebd9f1c7e09ef7c631294fb6c300975bb30b19896
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to a known malicious redirector, masquerading as free game hacks or currency generators. The primary lure URL is http://netcdn.tw/app/431946152/oprewards-free-robux-game-hack, which is likely intended to lead users to a phishing or malware download site. No scripts were extracted, but the document's structure and embedded URLs strongly indicate a social engineering attack.

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/oprewards-free-robux-game-hack In PDF document text
    • http://digilib.uim.ac.id/repository/how-to-get-minecraft-for-free-on-pc_GM479516143.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/how-to-get-free-robux-hack-2021_GM431946152.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/minecraft-education-edition-free-download_GM479516143.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/free-coin-master-coins-and-spins_GM406889139.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/how-tommake-a-roblox-hack_GM431946152.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/minecraft-hack-client-download_GM479516143.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/how-to-get-free-coins-on-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/coin-master-free-spins-and-coins-hack_GM406889139.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/hacked-roblox-game_GM431946152.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/coin-master-hack-apk-with-fb-login_GM406889139.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/rbx-free_GM431946152.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/robux-robux_GM431946152.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/give-me-robux_GM431946152.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/robux-hack-me_GM431946152.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/roblox-hack-2021-online_GM431946152.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/coin-master-hack-coins_GM406889139.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/free-robux-with-no-human-verification_GM431946152.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/q-clash-roblox-free_GM431946152.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/minecraft-pe-hacks-2021_GM479516143.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/xsos-hack-roblox_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
font_00_sfnt_off0000312f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x312F 22272 bytes
SHA-256: b90df60fbbfeb197813c4b9e8946cce6dd4e8ba2fc959215d0bc00580deed65d
font_01_sfnt_off000062b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x62B2 19228 bytes
SHA-256: 28d2551d9716c0c1f642d1de59876c155fe982ad5f1d32fc26186d5dbb125a3e

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