Malicious PDF — malware analysis report

Static analysis result for SHA-256 59e23df3c0e5555c…

MALICIOUS

PDF

37.2 KB Created: 2021-07-04 07:47:16 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-11
MD5: a95d6ff3b8e57245afa8ca9213ecc5b3 SHA-1: 4e1bf69d5cfd714faa0f26287ba14fcc50fdead5 SHA-256: 59e23df3c0e5555c971e179228d88071e85e65e673807aeb92cc5e56a57c88a1
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links that redirect to malicious infrastructure, specifically promoting 'free generators' and 'game hacks' for Roblox. The primary lure URL is http://netcdn.tw/app/431946152/robloxfun-com-robux-game-hack. While no scripts were extracted, the presence of numerous embedded URLs and the ML classifier's high confidence indicate a malicious intent to redirect users to potentially harmful content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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/robloxfun-com-robux-game-hack In PDF document text
    • http://stikespantirapih.ac.id/home/repository/what-is-a-robux_GM431946152.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/how-to-get-free-robux-and-tix-on-roblox-2021_GM431946152.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/best-expolists-roblox-free_GM431946152.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/roblox-rape-hack_GM431946152.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/best-free-robux-sites_GM431946152.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/roblox-cubes-of-god-hacks_GM431946152.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/how-to-put-iny-hack-on-any-roblox-game_GM431946152.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/how-to-get-free-shields-on-coin-master_GM406889139.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/robux-hack-no-game-download_GM431946152.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/how-to-change-your-roblox-username-for-free_GM431946152.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/how-to-get-free-roblox-items-2021_GM431946152.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/make-your-own-minecraft-server-free_GM479516143.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/robux-hack-no-survey-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/how-to-make-your-own-hacks-for-roblox_GM431946152.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/how-to-wall-hack-in-roblox-after-patch_GM431946152.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/how-do-get-robux-for-free_GM431946152.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/roblox-speed-hack-2021-november_GM431946152.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/cm-spins_GM406889139.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/coin-master-hack-2021-no-survey_GM406889139.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/hacks-for-liberty-city-roblox_GM431946152.pdfIn PDF document text
    • https://www.roblox.com/.IIn 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_off00003bfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3BFB 22260 bytes
SHA-256: d6176988c5211132ecf103299f082220ad51bbcba5d19dc32ccb118a7ef36b08
font_01_sfnt_off00006d2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6D2A 18884 bytes
SHA-256: 1cf3260265f7ee081a4002ebb70d89eea59c62c50fe2f65c39eaed554a14a9c3

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