Malicious PDF — malware analysis report

Static analysis result for SHA-256 cff39f14873e9997…

MALICIOUS

PDF

33.9 KB Created: 2021-07-04 15:28:39 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 8e7cc66bd276ebca51e9b9bf4a28e053 SHA-1: e23e57788a71361ad126a352e8d894880cce435d SHA-256: cff39f14873e99972d89fc0404da2f17622b4cbf3ecf2384fe345b30097052da
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains multiple embedded links and a call-to-action phrase, strongly suggesting a phishing or scam attempt. The primary link, http://netcdn.tw/app/406889139/coin-master-free-spins-ios-app-game-hack, is identified as a malicious redirector and a lure for game-related cheats. While no scripts were explicitly extracted, the nature of the lure and the embedded URLs point towards a social engineering attack designed to trick users into visiting a malicious site.

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/406889139/coin-master-free-spins-ios-app-game-hack In PDF document text
    • https://digilib.stimlog.ac.id/repository/hacking-roblox-thumbnail_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/roblox-free-group-uniform_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/roblox-redeem-card-codes-2021-free-robux_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/one-piece-final-chapter-youtube-roblox-hack_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/roblox-bloxburg-free-play_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/roblox-prison-break-hacks_GM431946152.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/new-hack-for-roblox-deathrun-2021-pc_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/fly-hack-download-roblox-2021_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/free-spin-today-coin-master_GM406889139.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/coin-master-free-spins-link-2021-twitter_GM406889139.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/cute-free-hairs-for-girls-in-roblox_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/is-there-a-way-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/redeem-code-roblox-free-robux-2021_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/roblox-pink-free-robux_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/roblox-free-robux-join-group_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/how-to-hack-a-group-in-roblox_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/coin-master-free-spin-download_GM406889139.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/robux-free-robux_GM431946152.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/minecraft-hack-mod_GM479516143.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/roblox-free-online-download_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_off0000309c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x309C 22284 bytes
SHA-256: ef67641becc388922e9799b71dc866ae8cd1366d1113b4d1ee018f66a3dfc567
font_01_sfnt_off00006234.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6234 18176 bytes
SHA-256: dc04036921b1963ee7132b828a33de2130f87ab3daccf07c14a967ac057e6417

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