Malicious PDF — malware analysis report

Static analysis result for SHA-256 642b49450b9a1f35…

MALICIOUS

PDF

45.3 KB Created: 2021-06-03 23:07:26 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-27
MD5: db2189fb6ec366299a7a726ce626d596 SHA-1: 284e0fa25035ca1e439ada17c6a87f70455995a6 SHA-256: 642b49450b9a1f35364ab248cd1c4795b103f26850daef185825cd72ea87f59b
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to redirector domains, specifically advertising 'free generator / game hack' lures. The document body and heuristics indicate a strong focus on directing users to external URLs, such as https://netcdn.online/app/431946152/codes-how-to-get-free-robux-game-hack, which is flagged as a malicious redirector. The presence of numerous links suggests an attempt to drive traffic to potentially malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

Heuristics 5

  • 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.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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/431946152/codes-how-to-get-free-robux-game-hack In PDF document text
    • http://library.umla.ac.id/repository/minecraft-java-free-download_GM479516143.pdfIn PDF document text
    • http://library.umla.ac.id/repository/free-daily-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id//repository/coin-master-tricks_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id/repository/coin-master-card-collection-link_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id//repository/minecraft-apk-114_GM479516143.pdfIn PDF document text
    • http://library.umla.ac.id/repository/coin-master-free-spin-realme-products_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id//repository/minecraft-java-edition-free-trial_GM479516143.pdfIn PDF document text
    • http://library.umla.ac.id//repository/free-roblox-adopt-me-pets_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id/repository/how-to-get-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id//repository/all-free-items-in-roblox_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id/repository/how-to-hack-coin-master-ios-no-jailbreak_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id/repository/coin-master-100-spin_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id//repository/free-robux-gift-card-generator_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id//repository/roblox-hacked-version-download_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id//repository/cm-free-spins-and-coins_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id//repository/free-spin-coin-master-2021-link_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id//repository/roblox-jailbreak-hack-download_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id/repository/who-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id//repository/coin-master-instagram-free-spins_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id//repository/coin-master-hack_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
stream_004_off000051f3.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x51F3 25856 bytes
SHA-256: 4c712676b72a5ae80e6cc9534676852dc868eda28e6c52233efe5399292713f0
font_01_sfnt_off00008dd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8DD3 18456 bytes
SHA-256: e7ed60d24a78ba6057de20e743a58d73d760a91b60c41324c250f3bd6f119d62

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