Malicious PDF — malware analysis report

Static analysis result for SHA-256 99f7c44ad3b6fdf7…

MALICIOUS

PDF

43.9 KB Created: 2021-06-04 01:39:24 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 39432ea66d1d28f9d196735701023b38 SHA-1: b7984e49dea77b7c3e8d3dd4c67cf5a74a92390a SHA-256: 99f7c44ad3b6fdf77f4e5d882687145643ac548e497acfeee63c3711db6617a8
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains embedded links that redirect to malicious infrastructure, specifically promoting a "game hack" lure. The primary link identified is https://netcdn.online/app/406889139/coin-master-free-cards-link-2021-today-game-hack. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate a malicious redirector designed to entice users to click through to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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/406889139/coin-master-free-cards-link-2021-today-game-hack In PDF document text
    • http://digilib.akbidarrahma.ac.id/repository/coin-master-cheat-codes-free_GM406889139.pdfIn PDF document text
    • http://digilib.akbidarrahma.ac.id/repository/free-gold-cards-for-coin-master_GM406889139.pdfIn PDF document text
    • http://digilib.akbidarrahma.ac.id/repository/bux-life-free-robux_GM431946152.pdfIn PDF document text
    • http://digilib.akbidarrahma.ac.id/repository/how-can-i-get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://digilib.akbidarrahma.ac.id/repository/coin-master-free-spin-and-coin_GM406889139.pdfIn PDF document text
    • http://digilib.akbidarrahma.ac.id/repository/free-minecraft-videos_GM479516143.pdfIn PDF document text
    • http://digilib.akbidarrahma.ac.id/repository/robux-no-human-verification_GM431946152.pdfIn PDF document text
    • http://digilib.akbidarrahma.ac.id/repository/fast-robux-online_GM431946152.pdfIn PDF document text
    • http://digilib.akbidarrahma.ac.id/repository/coin-master-free-spins-youthnow_GM406889139.pdfIn PDF document text
    • http://digilib.akbidarrahma.ac.id/repository/install-free-game-coin-master_GM406889139.pdfIn PDF document text
    • http://digilib.akbidarrahma.ac.id/repository/roblox-report-hacker_GM431946152.pdfIn PDF document text
    • http://digilib.akbidarrahma.ac.id/repository/coin-master-hack-tool-no-human-verification_GM406889139.pdfIn PDF document text
    • http://digilib.akbidarrahma.ac.id/repository/http-blackgamesus-coinmasterhack_GM406889139.pdfIn PDF document text
    • http://digilib.akbidarrahma.ac.id/repository/roblox-hack-codes_GM431946152.pdfIn PDF document text
    • http://digilib.akbidarrahma.ac.id/repository/games-on-roblox-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • http://digilib.akbidarrahma.ac.id/repository/rbl-gg-free-robux_GM431946152.pdfIn PDF document text
    • http://digilib.akbidarrahma.ac.id/repository/coin-master-daily-spins_GM406889139.pdfIn PDF document text
    • http://digilib.akbidarrahma.ac.id/repository/free-spins-coin-master-without-survey_GM406889139.pdfIn PDF document text
    • http://digilib.akbidarrahma.ac.id/repository/free-roblox-intros_GM431946152.pdfIn PDF document text
    • http://digilib.akbidarrahma.ac.id/repository/how-to-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_004_off000050fd.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x50FD 24696 bytes
SHA-256: 07b99d0f984ad52def3fe029cc5cc19288a733abec26a8890f103a706daea9bd
font_01_sfnt_off000087d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x87D0 18636 bytes
SHA-256: d718e2cb50f6f6a34b32f5d5c2dca0cb672e7940673eb9b7e66d247dab8a0a4b

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