Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec2d126bb19ad522…

MALICIOUS

PDF

42.2 KB Created: 2021-05-10 13:34:38 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 4596faccae75edc6ffb2bc55ece49dad SHA-1: 55d0d7189c1190eca47a3ec15e1ba0f86c405c1c SHA-256: ec2d126bb19ad52275626b45172d09c7f91e63bac5df97354b8016c2dd7d52f5
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to known malicious redirectors, specifically advertising 'free gifts' and 'game hacks'. The document body and embedded URLs strongly suggest a lure for users to click through to potentially malicious websites. While no scripts were explicitly extracted, the PDF structure and the nature of the links indicate a phishing or scam attempt, likely delivered as a spearphishing attachment.

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/free-gifts-coin-master-game-hack In PDF document text
    • http://akbidprimahusada.ac.id/elibrary/repository/how-do-you-install-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://akbidprimahusada.ac.id/elibrary/repository/free-back-accessories-roblox_GM431946152.pdfIn PDF document text
    • http://akbidprimahusada.ac.id/elibrary//repository/hack-coin-master-8-ball-pool_GM406889139.pdfIn PDF document text
    • http://akbidprimahusada.ac.id/elibrary//repository/roblox-com-free-robux_GM431946152.pdfIn PDF document text
    • http://akbidprimahusada.ac.id/elibrary/repository/can-i-get-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://akbidprimahusada.ac.id/elibrary//repository/www-roblox-com-free-robux_GM431946152.pdfIn PDF document text
    • http://akbidprimahusada.ac.id/elibrary/repository/coin-master-rewards-2021_GM406889139.pdfIn PDF document text
    • http://akbidprimahusada.ac.id/elibrary//repository/get-free-robux-today_GM431946152.pdfIn PDF document text
    • http://akbidprimahusada.ac.id/elibrary/repository/coin-master-hack-apk-android-1_GM406889139.pdfIn PDF document text
    • http://akbidprimahusada.ac.id/elibrary//repository/roblox-its-free_GM431946152.pdfIn PDF document text
    • http://akbidprimahusada.ac.id/elibrary//repository/coin-master-hack-online_GM406889139.pdfIn PDF document text
    • http://akbidprimahusada.ac.id/elibrary/repository/show-me-how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://akbidprimahusada.ac.id/elibrary//repository/free-robux-generator-2021_GM431946152.pdfIn PDF document text
    • http://akbidprimahusada.ac.id/elibrary/repository/best-minecraft-hacked-client-2021_GM479516143.pdfIn PDF document text
    • http://akbidprimahusada.ac.id/elibrary/repository/free-minecraft-generator_GM479516143.pdfIn PDF document text
    • http://akbidprimahusada.ac.id/elibrary/repository/robux-codes-generator-no-human-verification_GM431946152.pdfIn PDF document text
    • http://akbidprimahusada.ac.id/elibrary/repository/free-spin-links-coin-master-october-30-2021_GM406889139.pdfIn PDF document text
    • http://akbidprimahusada.ac.id/elibrary//repository/coin-master-free-coins-amp_GM406889139.pdfIn PDF document text
    • http://akbidprimahusada.ac.id/elibrary/repository/roblox-play-now-for-free_GM431946152.pdfIn PDF document text
    • http://akbidprimahusada.ac.id/elibrary//repository/how-to-get-free-minecraft-coins_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_off00004b04.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4B04 25296 bytes
SHA-256: 57a95f121caf3418ca41e87b87bff1e43dfe1ef5db94f606c63191faa27cae45
font_01_sfnt_off00008487.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8487 17712 bytes
SHA-256: 982f424818d2cc6c65a12e1040d006be3e19cba50bc69db2ca0f75fa75a43871

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