Malicious PDF — malware analysis report

Static analysis result for SHA-256 0677f3fb031bb657…

MALICIOUS

PDF

48.5 KB Created: 2021-06-04 02:27:39 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-24
MD5: dd32161b4a5d0b695c8cd22ec79bbcb5 SHA-1: aadef040688e9c631c1e460045d3afdf5c57b14a SHA-256: 0677f3fb031bb657f9a57044e975ee1cfb0e2298aa607e3df50c028aaad7f5c2
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to a known malicious redirector infrastructure, specifically advertising 'Robux Hack Generator' and related game cheats. The document body and embedded links suggest a lure to download a file, likely a second-stage payload. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9871

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.online/app/431946152/robux-hack-generator-game-hack In PDF document text
    • http://e-library.akbid-purworejo.ac.id//repository/hacks-roblox_GM431946152.pdfIn PDF document text
    • http://e-library.akbid-purworejo.ac.id//repository/free-robux-easy_GM431946152.pdfIn PDF document text
    • http://e-library.akbid-purworejo.ac.id//repository/free-roblox-generator_GM431946152.pdfIn PDF document text
    • http://e-library.akbid-purworejo.ac.id/repository/coins-master-hack_GM406889139.pdfIn PDF document text
    • http://e-library.akbid-purworejo.ac.id//repository/free-hair-roblox-boy_GM431946152.pdfIn PDF document text
    • http://e-library.akbid-purworejo.ac.id//repository/how-to-get-minecraft-for-free-on-computer_GM479516143.pdfIn PDF document text
    • http://e-library.akbid-purworejo.ac.id/repository/best-free-minecraft-texture-packs_GM479516143.pdfIn PDF document text
    • http://e-library.akbid-purworejo.ac.id//repository/roblox-login-hack_GM431946152.pdfIn PDF document text
    • http://e-library.akbid-purworejo.ac.id//repository/coin-master-hack-online-no-human-verification_GM406889139.pdfIn PDF document text
    • http://e-library.akbid-purworejo.ac.id/repository/coin-master-pc-hack-download_GM406889139.pdfIn PDF document text
    • http://e-library.akbid-purworejo.ac.id//repository/hey-google-how-do-you-get-free-robux_GM431946152.pdfIn PDF document text
    • http://e-library.akbid-purworejo.ac.id/repository/coin-master-free-spins-link-hack_GM406889139.pdfIn PDF document text
    • http://e-library.akbid-purworejo.ac.id//repository/hack-master-coin_GM406889139.pdfIn PDF document text
    • http://e-library.akbid-purworejo.ac.id/repository/unlimited-robux-2021_GM431946152.pdfIn PDF document text
    • http://e-library.akbid-purworejo.ac.id/repository/funbloxxyz-free-robux_GM431946152.pdfIn PDF document text
    • http://e-library.akbid-purworejo.ac.id/repository/minecraft-survival-free_GM479516143.pdfIn PDF document text
    • http://e-library.akbid-purworejo.ac.id//repository/get-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://e-library.akbid-purworejo.ac.id/repository/free-robux-working_GM431946152.pdfIn PDF document text
    • http://e-library.akbid-purworejo.ac.id/repository/how-to-get-free-roebucks-without-verification_GM431946152.pdfIn PDF document text
    • http://e-library.akbid-purworejo.ac.id//repository/coin-master-fan-hack_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_off00005089.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5089 32588 bytes
SHA-256: 67dde01c6690dad0d7666df357df6da1a4639fd76b165131de636aa40ce76aa3
font_01_sfnt_off00009afb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9AFB 18352 bytes
SHA-256: f5433ce3dc9930d213a8e7315569ee207b9df6dd56817c97a1fb358bc14a6a3b

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