Malicious PDF — malware analysis report

Static analysis result for SHA-256 5555cb3c28c48c55…

MALICIOUS

PDF

42.8 KB Created: 2021-05-13 06:00:43 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: f8fb638a2858583b90bd2540dc161ce0 SHA-1: 497a00525e0192948cebd240f58a1e26e4b179e6 SHA-256: 5555cb3c28c48c553572fd2b2dfe752e749b7a91f93cd2014324aeb775b70b3c
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains multiple links designed to lure the user to a malicious redirector. The primary malicious URL identified is https://netcdn.xyz/app/431946152/op-rewards-free-robux-game-hack, which is flagged as a known malicious redirector. The document body and embedded links suggest a scam related to game hacks or free in-game currency, a common social engineering tactic. No scripts were extracted, but the presence of malicious links and the ML classifier output strongly indicate malicious intent.

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/431946152/op-rewards-free-robux-game-hack In PDF document text
    • http://lib.akper17.ac.id/repository/coin-master-free-spins-2021_GM406889139.pdfIn PDF document text
    • http://lib.akper17.ac.id/repository/free-daily-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.akper17.ac.id/repository/omplete-surveys-for-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://lib.akper17.ac.id/repository/free-coins-for-flip-master_GM406889139.pdfIn PDF document text
    • http://lib.akper17.ac.id/repository/free-girl-hair-roblox_GM431946152.pdfIn PDF document text
    • http://lib.akper17.ac.id/repository/coin-master-apk-hack-2021-ios_GM406889139.pdfIn PDF document text
    • http://lib.akper17.ac.id/repository/xray-hack_GM479516143.pdfIn PDF document text
    • http://lib.akper17.ac.id/repository/free-robux-without-doing-anything_GM431946152.pdfIn PDF document text
    • http://lib.akper17.ac.id/repository/minecraft-free-download-windows-10_GM479516143.pdfIn PDF document text
    • http://lib.akper17.ac.id/repository/how-to-get-free-robux-easy-hack_GM431946152.pdfIn PDF document text
    • http://lib.akper17.ac.id/repository/bux-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.akper17.ac.id/repository/fighting-free-card-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.akper17.ac.id/repository/coin-master-jackpot-hack_GM406889139.pdfIn PDF document text
    • http://lib.akper17.ac.id/repository/how-to-start-a-minecraft-server-for-free_GM479516143.pdfIn PDF document text
    • http://lib.akper17.ac.id/repository/mangocheats-com-hack-coin-master-cheat_GM406889139.pdfIn PDF document text
    • http://lib.akper17.ac.id/repository/roblox-hack-game_GM431946152.pdfIn PDF document text
    • http://lib.akper17.ac.id/repository/impact-minecraft-hack_GM479516143.pdfIn PDF document text
    • http://lib.akper17.ac.id/repository/download-coin-master-apk-hacked_GM406889139.pdfIn PDF document text
    • http://lib.akper17.ac.id/repository/apps-for-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.akper17.ac.id/repository/www-free-robux-com_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_003_off00004a88.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4A88 25040 bytes
SHA-256: d0fffd8f73c0ebcaeae59ee12b52cc58e4013dca04697fc6ac455883e5660a67
font_01_sfnt_off00008378.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8378 18756 bytes
SHA-256: 060429e30aee9ae32e68a5a96a6a224aa27ea33c727993be362f9dfde6d66d3f

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