Malicious PDF — malware analysis report

Static analysis result for SHA-256 e377bde3a4dbcf9b…

MALICIOUS

PDF

34.3 KB Created: 2021-06-27 04:54:54 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 87aaee552a71561d6b25b203784a36c1 SHA-1: 950b693c2a5dd9d8dbc051173dfb0858d4eeffd1 SHA-256: e377bde3a4dbcf9b986cc57cb0293ea026e8fa3eaef3d06ee0f9c1fb72468d77
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to websites that are flagged as malicious redirectors, specifically advertising game hacks and free currency for popular games. The ML classifier also strongly indicated maliciousness. The presence of embedded URLs and the lure of 'free generators' suggest a phishing or malware distribution attempt, likely initiated via a spearphishing attachment.

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/roblox-free-robux-net-game-hack In PDF document text
    • http://stikespantirapih.ac.id/home/repository/kat-hack-roblox_GM431946152.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/how-to-get-a-halo-in-roblox-royale-high-hack_GM431946152.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/hack-account-roblox-with-link_GM431946152.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/coin-master-hack-apk-2021_GM406889139.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/roblox-robux-codes-2021_GM431946152.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/coin-master-hack-tool-apk-download_GM406889139.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/coin-master-cracked-apk-free-download_GM406889139.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/how-to-get-hacks-on-minecraft_GM479516143.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/free-texture-packs-for-minecraft-pe_GM479516143.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/orewards-com-free-robux_GM431946152.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/free-coins-coin-master-haktuts_GM406889139.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/free-spin-link-for-coin-master_GM406889139.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/free-robux-real_GM431946152.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/rbxcity-free-robux_GM431946152.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/how-to-make-a-hacking-script-for-roblox_GM431946152.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/free-robux-for-kids_GM431946152.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/free-robux-promo-codes_GM431946152.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/how-to-use-winrar-for-hacks-roblox_GM431946152.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/chisel-and-bits-mod-minecraft-pe_GM479516143.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/roblox-apk-hack-2021_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_off00002fd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2FD0 22260 bytes
SHA-256: 0568323dbcf936665f4201c959d60033b05577282b9dff9981329922903d25ca
font_01_sfnt_off00006159.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6159 18896 bytes
SHA-256: 96619fe85a74136e0b6476b62376a3718f37f452b3d5361aff67f7b4dfccd3d1

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