Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbb71a631b1c6ef5…

MALICIOUS

PDF

41.1 KB Created: 2021-05-10 15:17:34 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 3826d2a4619177d76752a36823402525 SHA-1: a831f95a12410ac0a739af2f8ce55f92fd1811ab SHA-256: dbb71a631b1c6ef5c2efa1639dd9c216a33c57d3e65a3426c056717226569dea
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document contains multiple links that redirect to known malicious infrastructure, specifically promoting game hacks and cheats. The ML classifier strongly indicated maliciousness, and the presence of a download button lure reinforces the deceptive nature of the document. The primary malicious link identified is https://netcdn.xyz/app/479516143/aternos-free-minecraft-server-game-hack, which is likely used to deliver a secondary payload.

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/479516143/aternos-free-minecraft-server-game-hack In PDF document text
    • https://library.fdk.ac.id/repository/coin-master-free-spins-hack_GM406889139.pdfIn PDF document text
    • https://library.fdk.ac.id/repository/coin-master-free-spin-trick_GM406889139.pdfIn PDF document text
    • https://library.fdk.ac.id/repository/minecraft-pe-015-0-apk-free-download_GM479516143.pdfIn PDF document text
    • https://library.fdk.ac.id/repository/coin-master-hack-xyz_GM406889139.pdfIn PDF document text
    • https://library.fdk.ac.id/repository/how-to-get-free-robux-without-doing-anything_GM431946152.pdfIn PDF document text
    • https://library.fdk.ac.id/repository/coin-master-hack-2021-ios_GM406889139.pdfIn PDF document text
    • https://library.fdk.ac.id/repository/free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • https://library.fdk.ac.id/repository/wurst-client_GM479516143.pdfIn PDF document text
    • https://library.fdk.ac.id/repository/ear-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • https://library.fdk.ac.id/repository/free-robux-android_GM431946152.pdfIn PDF document text
    • https://library.fdk.ac.id/repository/free-roblox-website_GM431946152.pdfIn PDF document text
    • https://library.fdk.ac.id/repository/how-to-hack-a-minecraft-server_GM479516143.pdfIn PDF document text
    • https://library.fdk.ac.id/repository/roblox-free-robux_GM431946152.pdfIn PDF document text
    • https://library.fdk.ac.id/repository/coin-master-hack-blog_GM406889139.pdfIn PDF document text
    • https://library.fdk.ac.id/repository/roblox-rewards-robux_GM431946152.pdfIn PDF document text
    • https://library.fdk.ac.id/repository/coin-master-heaven-free-spins-today_GM406889139.pdfIn PDF document text
    • https://library.fdk.ac.id/repository/free-robux-hack-us_GM431946152.pdfIn PDF document text
    • https://library.fdk.ac.id/repository/spin-links-for-coin-master_GM406889139.pdfIn PDF document text
    • https://library.fdk.ac.id/repository/coin-master-free-spins-today-daily-links_GM406889139.pdfIn PDF document text
    • https://library.fdk.ac.id/repository/coin-master-hack-8-ball-pool_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_003_off0000468c.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x468C 24796 bytes
SHA-256: 81e99147200aab8fc47b1624bbd745bd2aee4db2f674a4f4ad1e0a8151a35b21
font_01_sfnt_off00007f63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7F63 17824 bytes
SHA-256: 04e228694d9982d1c7efe163f2653fab57675f1ecbbe7e635aa0b095f728f7e2

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