Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1f14a9d39f0da40…

MALICIOUS

PDF

43.7 KB Created: 2021-06-11 09:18:17 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 143548b182990817a122d49ae4047f93 SHA-1: b8df70328a8f6d5f3192901dedee30f9a0ef7edf SHA-256: c1f14a9d39f0da408f3769a79a8fbd43c37db51cd55727dbc34c3892b981e9ab
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to redirectors and SEO link farms, masquerading as game hacks and free currency generators. The primary redirector URL is https://netcdn.tw/app/431946152/how-to-hack-roblox-mad-games-game-hack, which likely leads to further malicious content or phishing pages. No scripts were extracted, but the document structure and embedded links strongly indicate a social engineering lure designed to drive traffic to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

Heuristics 5

  • 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.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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/how-to-hack-roblox-mad-games-game-hack In PDF document text
    • http://www.library.umbjm.ac.id/repository/how-to-get-free-robux-on-pc_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/free-robux-script-pastebin-10-29-2021_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/free-minecraft-bedrock-server-hosting_GM479516143.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/youtube-how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/dll-files-hack-for-roblox-vehicle-simulator-2021_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/how-to-hack-a-roblox-accout_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/how-to-get-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/roblox-lumber-tycoon-hack-money_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/coin-master-free-coins-amp_GM406889139.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/como-vestirse-hackear-roblox_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/download-coin-master-hack-tool-v1-9_GM406889139.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/how-do-people-get-hacked-followers-on-roblox_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/how-to-cheat-in-roblox-treasure-hunt_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/how-to-get-free-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/el-mejor-hack-para-juegos-de-roblox_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/robux-hack-no-survey_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/hack-robux_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/roblox-free-robux-com_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/free-roblox-money_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/coin-master-hack-for-android_GM406889139.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
stream_004_off00004fff.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4FFF 23648 bytes
SHA-256: 95bc02b1689aff5d2e57d411c845b50a4c0b025c37aedadefb351f38d84c5572
font_01_sfnt_off000085cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x85CD 18976 bytes
SHA-256: 791467070d618b7e468ad0a06047c2a69443c41cd0f657b5f60bfb666050c473

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