Malicious PDF — malware analysis report

Static analysis result for SHA-256 5019b0f56535a566…

MALICIOUS

PDF

40.8 KB Created: 2021-05-10 13:35:10 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 7c42130ca10c67355f83cbc19d2a353c SHA-1: a9f38ac7f90aaf1da74897b124c264be64bebf00 SHA-256: 5019b0f56535a566ae65992b8072ec35079d81352226d931bd4157df03f4befb
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains multiple links to what appears to be a malicious redirector infrastructure, disguised as a "Coin Master Hack" generator. The document body and embedded URLs strongly suggest a lure to trick users into downloading or visiting malicious content. The presence of multiple redirector links and the ML classifier output indicate a high likelihood of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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 https://netcdn.xyz/app/406889139/coin-master-hack-spins-apk-game-hack In PDF document text
    • http://digilib.stiki.ac.id/repository/free-minecraft-maps-pe_GM479516143.pdfIn PDF document text
    • http://digilib.stiki.ac.id/repository/how-to-hack-coin-master-computer_GM406889139.pdfIn PDF document text
    • http://digilib.stiki.ac.id/repository/vip-roblox-free_GM431946152.pdfIn PDF document text
    • http://digilib.stiki.ac.id/repository/how-to-get-free-robux-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://digilib.stiki.ac.id/repository/how-can-u-get-free-robux_GM431946152.pdfIn PDF document text
    • http://digilib.stiki.ac.id/repository/blogspot-coin-master_GM406889139.pdfIn PDF document text
    • http://digilib.stiki.ac.id/repository/minecraft-for-laptop-free_GM479516143.pdfIn PDF document text
    • http://digilib.stiki.ac.id/repository/ways-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://digilib.stiki.ac.id/repository/coin-master-mod-apk-free-download_GM406889139.pdfIn PDF document text
    • http://digilib.stiki.ac.id/repository/coin-master-spins_GM406889139.pdfIn PDF document text
    • http://digilib.stiki.ac.id/repository/how-to-get-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • http://digilib.stiki.ac.id/repository/play-full-version-of-minecraft-for-free-no-download_GM479516143.pdfIn PDF document text
    • http://digilib.stiki.ac.id/repository/roblox-robux_GM431946152.pdfIn PDF document text
    • http://digilib.stiki.ac.id/repository/roblox-source_GM431946152.pdfIn PDF document text
    • http://digilib.stiki.ac.id/repository/microsoft-bing-free-robux_GM431946152.pdfIn PDF document text
    • http://digilib.stiki.ac.id/repository/roblox-controversy_GM431946152.pdfIn PDF document text
    • http://digilib.stiki.ac.id/repository/how-to-play-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://digilib.stiki.ac.id/repository/www-roblox-com-robux-free_GM431946152.pdfIn PDF document text
    • http://digilib.stiki.ac.id/repository/minecraft-hack-download_GM479516143.pdfIn PDF document text
    • http://digilib.stiki.ac.id/repository/best-free-minecraft-hacked-client_GM479516143.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_003_off000046e5.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x46E5 24164 bytes
SHA-256: 73e3d963d4ebf6b747e4f71e2932d157291536df569a00357fe176a7695fc276
font_01_sfnt_off00007e12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7E12 17892 bytes
SHA-256: 116ba2d485dba3cc3c3f0b67c538e954af0badc3125826b285df3e1af5dac94f

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