Malicious PDF — malware analysis report

Static analysis result for SHA-256 44dc4d2b20d97e20…

MALICIOUS

PDF

34.7 KB Created: 2021-06-29 09:18:49 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-11
MD5: b4618a2629ef0fcdd690240d0b0c07d5 SHA-1: cd609ff2156e47702759ab9f1a7b4c9279743965 SHA-256: 44dc4d2b20d97e20a746aefd70b573fda505a3c2bde49f7513416151d08f7fad
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to external websites, including a known malicious redirector at http://netcdn.co/app/431946152/free-robux-hack-no-verification-no-survey-game-hack. These links are presented as lures for free game currency or hacks, indicating a social engineering tactic to drive users to potentially malicious sites. No scripts were extracted, but the presence of malicious redirectors and the lure 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.co/app/431946152/free-robux-hack-no-verification-no-survey-game-hack In PDF document text
    • https://razredna-nastava.net/files/microsoft-bing-free-robux_GM431946152.pdfIn PDF document text
    • http://razredna-nastava.net/files/atticus-129-roblox-hacked-image_GM431946152.pdfIn PDF document text
    • https://razredna-nastava.net/files/vehicle-simulator-hack-money-roblox_GM431946152.pdfIn PDF document text
    • http://razredna-nastava.net/files/how-can-you-get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://razredna-nastava.net/files/robux-miner_GM431946152.pdfIn PDF document text
    • http://razredna-nastava.net/files/coin-master-free-spins-link-today_GM406889139.pdfIn PDF document text
    • http://razredna-nastava.net/files/coin-master-apk-hack_GM406889139.pdfIn PDF document text
    • https://razredna-nastava.net/files/free-working-promocodes-for-roblox_GM431946152.pdfIn PDF document text
    • http://razredna-nastava.net/files/how-to-hack-someones-roblox-account-2021_GM431946152.pdfIn PDF document text
    • http://razredna-nastava.net/files/coin-master-apk-hack-35-8_GM406889139.pdfIn PDF document text
    • https://razredna-nastava.net/files/how-to-use-scripts-in-roblox-hack_GM431946152.pdfIn PDF document text
    • http://razredna-nastava.net/files/coin-master-online-hack-link_GM406889139.pdfIn PDF document text
    • http://razredna-nastava.net/files/how-to-download-minecraft-for-free-on-android_GM479516143.pdfIn PDF document text
    • https://razredna-nastava.net/files/how-to-hack-on-hilton-hotels-roblox_GM431946152.pdfIn PDF document text
    • http://razredna-nastava.net/files/roblox-mod-free-robux_GM431946152.pdfIn PDF document text
    • https://razredna-nastava.net/files/how-to-get-tiktok-famous-free_GM835599320.pdfIn PDF document text
    • http://razredna-nastava.net/files/coin-master-hack-mod-apk-35-8_GM406889139.pdfIn PDF document text
    • https://razredna-nastava.net/files/coin-master-unlimited-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • https://razredna-nastava.net/files/clients-minecraft_GM479516143.pdfIn PDF document text
    • http://razredna-nastava.net/files/free-cheat-codes-for-coin-master_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_off00002f5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2F5E 22368 bytes
SHA-256: 57159c8b40772e51e424d7f025c479997eaaa55208d07d90495fdd87a15dba75
font_01_sfnt_off00006121.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6121 19540 bytes
SHA-256: e60a6b52d1a7f3a9258a45010845953f53f024909fc30757e5d7fd9f0877f25f

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