Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2f799ad87132adb…

MALICIOUS

PDF

34.7 KB Created: 2021-06-19 02:55:20 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-20
MD5: dbd4082ae803202d6c5eae7487c7197a SHA-1: 0aa5b455fe674deea013b53db73260cdd4291801 SHA-256: a2f799ad87132adb98495c3e4e1d668db108059c20aa8c94f91227efcc5fa76c
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to known malicious redirectors and lures users with promises of free game hacks and in-game currency. The primary redirector URL is http://netcdn.co/app/431946152/anything-free-on-the-catalog-on-roblox-game-hack, which is likely used to distribute further malicious payloads or lead to phishing sites. No scripts were extracted, but the embedded URLs and heuristic firings 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.co/app/431946152/anything-free-on-the-catalog-on-roblox-game-hack In PDF document text
    • http://digilib.stimlog.ac.id/repository/coin-master-hack-version-2021-free-download_GM406889139.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/coin-master-daily-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/free-spins-and-coins-coin-master-2021-link_GM406889139.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/op-rewards-robux_GM431946152.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/how-to-get-free-robux-easy-2021_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/coin-master-free-gold-cards-link_GM406889139.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/how-can-u-get-free-robux_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/d-day-roblox-hack_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/speed-hack-code-for-roblox_GM431946152.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/coin-master-hack-lost-world-2021_GM406889139.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/coin-master-free-spins-today-daily-links_GM406889139.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/coin-master-free-spins-link-haktuts_GM406889139.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/pubg-uc-17_GM1330123889.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/coin-master-blogspot-links_GM406889139.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/hacking-is-bad-roblox-id_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/how-to-earn-free-robux-in-roblox-2021_GM431946152.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/how-to-download-roblox-hack-apk_GM431946152.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/20210-robux_GM431946152.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/minecraft-realms-free_GM479516143.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/coin-master-spin-hack-trick_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
font_00_sfnt_off00003110.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3110 22092 bytes
SHA-256: 487ad7d9a8cff8b094d1a90a7873665959200062f01f7d87e3c0529af078f4d8
font_01_sfnt_off00006222.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6222 19220 bytes
SHA-256: 2112dca1ca563d214e9e7d91b85557e13bd049fcc377d701b3f62b496fb34fec

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