Malicious PDF — malware analysis report

Static analysis result for SHA-256 1850cc2c75118ead…

MALICIOUS

PDF

33.6 KB Created: 2021-07-04 14:41:06 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 621e81d2759ddac6a7333f0bda907a8d SHA-1: 479a9f00622451ba125949442cbc30e5aefbcbb5 SHA-256: 1850cc2c75118ead36e4177396bd2e6c80fcc9bfe0e2f96cca31f4ca60dcd5e6
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple heuristics indicating it's a malicious redirector lure, specifically targeting users interested in game hacks and free currency. The document body and embedded URLs point to a primary redirector at http://netcdn.tw/app/431946152/free-robux-1-click-game-hack, which is designed to lead users to potentially harmful content. No scripts were extracted, but the overall pattern suggests a phishing or scam 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/431946152/free-robux-1-click-game-hack In PDF document text
    • https://digilib.stimlog.ac.id/repository/roblox-hacked-online-game_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/coin-master-free-spins-2-5-2021_GM406889139.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/illegal-roblox-hacks_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/free-robux-generator-no-survey-no-download-no-human-verification_GM431946152.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/coin-master-free-spins-link-hack_GM406889139.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/free-spins-coin-master-apple_GM406889139.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/how-to-hack-in-roblox-got-talent_GM431946152.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/how-to-hack-coin-master-using-es-file_GM406889139.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/how-do-you-get-free-robux-without-doing-anything_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/free-4k-robux_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/all-hack-week-2021-projects-roblox_GM431946152.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/roblox-hack-generator_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/impact-minecraft-hack_GM479516143.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/roblox-filter-anti-cheat_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/roblox-project-pokemon-free-pokemon_GM431946152.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/coin-master-34-4-hack_GM406889139.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/earn-free-robux-for-roblox_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/roblox-hacks-counterbloxrobloxofensibe_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/how-to-get-minecraft-for-free-on-chromebook_GM479516143.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/how-to-hack-lola202198-roblox_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
font_00_sfnt_off00002d0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2D0D 22104 bytes
SHA-256: aff9ab454fb2758a94ffdf687113223c2330e8997b334fbeca4d57d3fe81c2e5
font_01_sfnt_off00005e0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5E0B 19188 bytes
SHA-256: fdc1e637a328f6ca8a44c6d65ec7553416421eb6bc609f9d5e0768d56a739c67

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