Malicious PDF — malware analysis report

Static analysis result for SHA-256 16a35e455259bd1f…

MALICIOUS

PDF

42.5 KB Created: 2021-05-12 15:44:21 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 793d4c7518ce1005be5b94674707f574 SHA-1: ef5fa1f5961a16236d731111883df0c853a48c11 SHA-256: 16a35e455259bd1f7585c7ea2b7a38fcc6a323a4f52dbfedd602013e12bfb3a9
130 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains a lure for a 'free game hack' and a prominent link to a suspicious URL. The 'SE_CLICKFIX' heuristic indicates the document instructs the user to execute a command, a common tactic to bypass security measures. The ML classifier also strongly flagged this PDF as malicious. The embedded URL is the primary indicator of a potential download or redirection to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 6

  • PDF links to a 'free generator / game hack' redirector high 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.
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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/479516143/minecraft-xbox-free-game-hack PDF link annotation
    • http://www.perpus.stfm.ac.id/repository/free-coin-master-spins-no-verification_GM406889139.pdfIn PDF document text
    • http://www.perpus.stfm.ac.id/repository/50-000-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://www.perpus.stfm.ac.id/repository/get-free-robux-now_GM431946152.pdfIn PDF document text
    • http://perpus.stfm.ac.id/repository/how-to-get-free-roblox_GM431946152.pdfIn PDF document text
    • http://perpus.stfm.ac.id/repository/free-robux-that-actually-works_GM431946152.pdfIn PDF document text
    • http://www.perpus.stfm.ac.id/repository/if-i-uninstall-minecraft-can-i-reinstall-it-for-free_GM479516143.pdfIn PDF document text
    • http://www.perpus.stfm.ac.id/repository/grabpoints-robux_GM431946152.pdfIn PDF document text
    • http://perpus.stfm.ac.id/repository/rbx-free_GM431946152.pdfIn PDF document text
    • http://www.perpus.stfm.ac.id/repository/free-robux-real_GM431946152.pdfIn PDF document text
    • http://perpus.stfm.ac.id/repository/blox-rewards_GM431946152.pdfIn PDF document text
    • http://www.perpus.stfm.ac.id/repository/bloxpage-free-robux_GM431946152.pdfIn PDF document text
    • http://perpus.stfm.ac.id/repository/coin-master-free-spins-and-coins-daily-links_GM406889139.pdfIn PDF document text
    • http://www.perpus.stfm.ac.id/repository/roblox-2021-hack_GM431946152.pdfIn PDF document text
    • http://www.perpus.stfm.ac.id/repository/microsoft-free-robux_GM431946152.pdfIn PDF document text
    • http://www.perpus.stfm.ac.id/repository/coin-master-game-hack-link_GM406889139.pdfIn PDF document text
    • http://www.perpus.stfm.ac.id/repository/hack-coin-master-ios_GM406889139.pdfIn PDF document text
    • http://www.perpus.stfm.ac.id/repository/roblox-hack-com_GM431946152.pdfIn PDF document text
    • http://perpus.stfm.ac.id/repository/free-robux-generator-com-roblox-hack_GM431946152.pdfIn PDF document text
    • http://perpus.stfm.ac.id/repository/minecraft-hacks-for-2b2t_GM479516143.pdfIn PDF document text
    • http://perpus.stfm.ac.id/repository/get-robux-for-free-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
stream_003_off00004a6d.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4A6D 25444 bytes
SHA-256: 584946cdf4663f1103b4b3eeb215244c65e5a66021789d685e6fbf3854bf2039
font_01_sfnt_off000083d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x83D1 18304 bytes
SHA-256: b19b3ee426dc01289f0e43c477ac2043c2327265a5c21cc50be6a14b80435fcf

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