Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a1204cc3050d4b5…

MALICIOUS

PDF

46.6 KB Created: 2021-06-03 04:11:08 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 5d19ce6d143c6e9d94ad25f38e1ff9e1 SHA-1: 523c50daf2e737071e1efac86a10c4aa3f0af5a8 SHA-256: 5a1204cc3050d4b59b23781c72eef6739d2c70ac9fd9d17f9b240efc42da844e
200 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link to a malicious redirector disguised as a 'free generator / game hack'. The heuristic 'SE_FAKE_CAPTCHA' suggests the document attempts to trick the user into performing an action, likely to bypass security or download further malware. The ML classifier also flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9832

Heuristics 5

  • 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.
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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.online/app/431946152/free-face-roblox-game-hack In PDF document text
    • https://digilib.stimlog.ac.id/repository/hack-crack-for-coin-master-currency_GM406889139.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/coins-master-hack_GM406889139.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/coin-master-free-spins-promo-code_GM406889139.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/free-robux-no-verification_GM431946152.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/coin-master-apk-hack-mod-download_GM406889139.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/free-tiktok-likes-no-human-verification-or-download_GM835599320.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/pubg-uc-17_GM1330123889.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/free-robux-2021-no-human-verification_GM431946152.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/roblox-hacked-accounts-list_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/roblox-free-bir_GM431946152.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/how-to-make-a-group-on-roblox-for-free_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/minecraft-apk-download-free-11-055_GM479516143.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/free-robux-no-generator_GM431946152.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/roblox-com-free_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/free-robux-group-payouts_GM431946152.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/free-spins-coin-master-daily_GM406889139.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/rbxoffers-com-free-robux_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/free-100-robux_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/coin-master-free-spins-2-5-2021_GM406889139.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/coin-master-blogspot-links_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
stream_004_off000051ee.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x51EE 28584 bytes
SHA-256: ee9d3b87281ccde6173392bfa40ea9fdc14008471843e2501b0cdcfd72423f50
font_01_sfnt_off000093ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x93EF 18176 bytes
SHA-256: 89cd2a226c48b85e3fd50639e1c54ff12a7aea6a284b12bd929af74d1649954d

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