Malicious PDF — malware analysis report

Static analysis result for SHA-256 9926893f5cfe78be…

MALICIOUS

PDF

45.0 KB Created: 2021-06-03 07:30:53 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-11
MD5: fd7e44fdabfd2c42cdd52269e3750a0b SHA-1: 84c6ddab6117eab9b8be93309451578505ccf6e6 SHA-256: 9926893f5cfe78be0339642afe6460ad83d2b5910bae26e203485320ba215c28
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to known malicious redirectors and lures users with promises of game hacks. The primary malicious URL identified is https://netcdn.online/app/835599320/tiktok-free-hearts-apk-game-hack. Although no scripts were explicitly extracted, the PDF structure and heuristic firings strongly indicate a malicious redirector workflow designed to lead users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9804

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/835599320/tiktok-free-hearts-apk-game-hack In PDF document text
    • http://library.stieyapan.ac.id//repository/robuxmatch-com-free-robux_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/robux-generator-no-verification-needed_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/coin-master-links-for-free-spins-2021_GM406889139.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/i-got-hacked-on-roblox_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/blox-land-free-robux_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/coin-master-game-hack-version-download_GM406889139.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/what-is-coin-master_GM406889139.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/i-need-robux_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/download-coin-master-free-spins-link-2021-today_GM406889139.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/coin-master-free-cards-hack_GM406889139.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/how-to-hack-roblox-accounts_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/free-coin-master-spins_GM406889139.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/hack-free-spin-coin-master_GM406889139.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/coin-master-free-cards-2021_GM406889139.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/bloxpage-free-robux_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/free-spin-link-coin-master-today_GM406889139.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/blogspot-coin-master-spins_GM406889139.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/minecraft-hack-download_GM479516143.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/free-robux-hacker-us_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/free-robux-no-verify-2021_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00004dd1.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4DD1 24108 bytes
SHA-256: 06e516fb0d81d54d9e8f73204566302d8ef5476c1e7fff4d6092f145a5cb347e
font_01_sfnt_off00008477.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8477 2840 bytes
SHA-256: 30dce2b9c1950da345d7fed8f00c38887adfa2f2ddecc31775af2315e819ac37
font_02_sfnt_off00008e2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8E2A 17860 bytes
SHA-256: e8290032a611d1fc2c6459a5ef0d650fd0d2bf07cef72e98ce9bcbca58034f04

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