Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb351b4f3f872f41…

MALICIOUS

PDF

34.4 KB Created: 2021-07-03 10:43:16 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 5d9a0923d0720eac82ecae227251ed40 SHA-1: 6d7c82c390055c335ff081095376850ac266dfbf SHA-256: cb351b4f3f872f414bcc91af1a409570ed7fe0411b68d9eb891db26dfdd3138d
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple heuristics indicating malicious redirector links, specifically targeting users with lures for game hacks and free currency. The primary malicious URL identified is http://netcdn.co/app/406889139/ios-coin-master-hack-game-hack, which is flagged as a known malicious redirector. The document body, though partially corrupted, contains references to this URL and other similar lures, reinforcing the phishing and redirection intent.

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.co/app/406889139/ios-coin-master-hack-game-hack In PDF document text
    • https://fib.ub.ac.id/sac/repository/do-you-get-windows-10-minecraft-for-free-with-java_GM479516143.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/how-to-add-mods-to-minecraft-pe_GM479516143.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/speed-hack-roblox-prison-life_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/addidas-tracsuit-roblox-for-free_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/how-to-get-free-money-on-roblox-lumber-tycoon-2_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/free-robux-free-and-easy_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/roblox-free-ro-ghoul-account_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/how-to-hack-minecraft_GM479516143.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/coin-master-free-spin-and-coin-links_GM406889139.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/how-to-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/before-dawn-hack-roblox_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac//repository/how-to-get-free-minecoins-in-minecraft_GM479516143.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/is-there-anyway-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/free-robux-generator-no-servey_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/moana-roblox-cheats_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/ban-hacks-roblox_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/coin-master-cheat-to-get-free-spins_GM406889139.pdfIn PDF document text
    • https://fib.ub.ac.id/sac//repository/coin-master-hack-tool-v1-9-download-free_GM406889139.pdfIn PDF document text
    • https://fib.ub.ac.id/sac//repository/how-do-you-get-roebucks-for-free_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/minecraft-pe-apk-download-free-015-0_GM479516143.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_off00003075.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3075 23252 bytes
SHA-256: 35db752ce36bf124559335d9af56d89e5186be806b6f11f4c319576ce45d6673
font_01_sfnt_off0000649f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x649F 18004 bytes
SHA-256: 1dea32a01bfce18b325b33ca5688a8bef39c34a40412565ca8fc8a7bb5032574

Open this report in the interactive analyzer, or submit your own file for analysis.