Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f41434b731a866d…

MALICIOUS

PDF

34.2 KB Created: 2021-07-06 03:47:54 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 5838b503889055c2b89cf74498e83666 SHA-1: a60aec10747a0ca598c55a5d470d3a952ab0b79e SHA-256: 4f41434b731a866d32911e7c4b43a87035ed73a0c0e32eb52756c6ba1ad0d72e
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links that redirect to malicious infrastructure, disguised as game hacks and generators. The primary lure URL is http://netcdn.tw/app/406889139/how-to-get-free-coins-on-coin-master-game-hack, which is flagged as a malicious redirector. No scripts were extracted, but the document's structure and embedded links strongly suggest a phishing or malware distribution attempt.

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.tw/app/406889139/how-to-get-free-coins-on-coin-master-game-hack In PDF document text
    • http://digilib.stiki.ac.id/repository/roblox-robux_GM431946152.pdfIn PDF document text
    • http://digilib.stiki.ac.id/repository/everythings-free-roblox-mm2-uncopylocked_GM431946152.pdfIn PDF document text
    • http://digilib.stiki.ac.id/repository/hack-pokemon-go-free_GM1094591345.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/kachifpro_GM406889139.pdfIn PDF document text
    • http://digilib.stiki.ac.id/repository/hack-with-password-for-robux_GM431946152.pdfIn PDF document text
    • http://digilib.stiki.ac.id/repository/free-robux-app_GM431946152.pdfIn PDF document text
    • http://digilib.stiki.ac.id/repository/how-to-hack-roblox-cash_GM431946152.pdfIn PDF document text
    • http://digilib.stiki.ac.id/repository/how-to-get-free-robux-without-downloading-any-apps_GM431946152.pdfIn PDF document text
    • http://digilib.stiki.ac.id/repository/coin-master-gold-cards-hack-english_GM406889139.pdfIn PDF document text
    • http://digilib.stiki.ac.id/repository/minecraft-free-unblocked_GM479516143.pdfIn PDF document text
    • http://digilib.stiki.ac.id/repository/get-free-robux-no-verification_GM431946152.pdfIn PDF document text
    • http://digilib.stiki.ac.id/repository/how-to-hack-a-roblox-account-password-2021_GM431946152.pdfIn PDF document text
    • http://digilib.stiki.ac.id/repository/robux-cheat_GM431946152.pdfIn PDF document text
    • http://digilib.stiki.ac.id/repository/daily-coin-master-link_GM406889139.pdfIn PDF document text
    • http://digilib.stiki.ac.id/repository/free-roblox-codes-2021_GM431946152.pdfIn PDF document text
    • http://digilib.stiki.ac.id/repository/ways-to-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://digilib.stiki.ac.id/repository/how-to-get-free-robux-on-youtube_GM431946152.pdfIn PDF document text
    • http://digilib.stiki.ac.id/repository/minecraft-free-trial_GM479516143.pdfIn PDF document text
    • http://digilib.stiki.ac.id/repository/free-minecraft-website_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_002_off0000306d.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x306D 22788 bytes
SHA-256: a77438bfa001226cb4261920315dd8bb36a755ebf1eda43e5f3207a5d6fb3e19
font_01_sfnt_off00006375.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6375 18164 bytes
SHA-256: 5528053adc999406168e17646d1dc5071297b1a782f96e9afbeaa1deed3ba253

Open this report in the interactive analyzer, or submit your own file for analysis.