Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f3090273bd75093…

MALICIOUS

PDF

35.1 KB Created: 2021-06-26 20:04:04 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 16805a0dd147d055d709b11bd0dedae6 SHA-1: 4e2edb114a266db853263cdc721beb468b03757a SHA-256: 4f3090273bd75093950ccec8c6e2a3704cba8114ac89b263868d6be6def11213
180 Risk Score

Malware Insights

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

This PDF document contains multiple links to known malicious redirectors and game-related lures, such as 'free generator / game hack'. The document body and extracted URLs suggest a phishing or malware distribution attempt, likely leveraging a spearphishing attachment vector. No scripts were extracted, but the presence of malicious links and the ML classifier's high confidence indicate a high likelihood of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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/479516143/minecraft-noob-vs-pro-vs-hacker-vs-god-game-hack In PDF document text
    • http://lib.stimykpn.ac.id/repository/freerobuxhack-us_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/roblox-trolling-hack_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id//repository/roblox-games-with-free-radio_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id//repository/is-windows-10-minecraft-free_GM479516143.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/free-robux-earn_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/10-robux_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/my-roblox-account-got-hacked-on-roblox_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/roblox-data-breach_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/minecraft-free-ios-2021_GM479516143.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/coin-master-real-free-spins_GM406889139.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/free-robux-in-roblox-freeee-worksss-2021_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id//repository/coin-master-online_GM406889139.pdfIn PDF document text
    • http://lib.stimykpn.ac.id//repository/how-to-get-free-cards-sets-for-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.stimykpn.ac.id//repository/archery-master-3d-apk-and-mod-free-download-unlimited-coins_GM406889139.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/wie-kann-man-wie-kann-man-cheaten-bei-roblox-geld_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id//repository/coin-master-free-chip_GM406889139.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/free-robux-generator-2021_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/free-robux-gift-card_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/free-robux-not-fake_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/roblox-anti-cheat-script_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
font_00_sfnt_off00003272.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3272 22628 bytes
SHA-256: 0d39bcd3d80aefb8f720425396c9c0d96a5c0f372a76ff589a29e8537972cef2
font_01_sfnt_off000064ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x64EA 18788 bytes
SHA-256: 73ec6ac80df223acd40be2e0a99cbfcc02b9dc3858d0872440f8b03ec1d9f2fc

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