Malicious PDF — malware analysis report

Static analysis result for SHA-256 220fec3bffaa899a…

MALICIOUS

PDF

44.3 KB Created: 2021-06-03 04:53:07 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 36c5927fff5867be4239e822ff3b1cba SHA-1: 320ff855d6c69493393744a615028b809bc15431 SHA-256: 220fec3bffaa899afb908aa9c9fdba7405e61a17f11cc950ad6000e4cdb32b87
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to external sites, including a known malicious redirector, under the guise of offering game hacks and rewards. The document body and heuristics indicate a lure to click these links, which likely leads to a phishing page or a download of further malicious content. No scripts were extracted, but the PDF structure and embedded URLs strongly suggest a malicious intent to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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/431946152/unlimited-robux-2021-game-hack In PDF document text
    • http://lib.stie-aub.ac.id/repository/free-rewards-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/get-free-robux-com_GM431946152.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/roblox-gift-card-online-free_GM431946152.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/coin-master-free-spins-and-coins-daily-links_GM406889139.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/how-to-get-minecraft-for-free-on-tablet_GM479516143.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/coin-master-hack-using-cheat-engine_GM406889139.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/free-robux-sites-that-work_GM431946152.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/free-robux-that-actually-works_GM431946152.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/coin-master-daily-free-spins-2021_GM406889139.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/roblox-redeem-codes-free_GM431946152.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/can-you-still-get-minecraft-windows-10-for-free_GM479516143.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/hack-tiktok-fans-free_GM835599320.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/how-do-i-get-free-coins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/coin-master-village-4_GM406889139.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/coin-master-free-spins-hack-download_GM406889139.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/hack-a-game_GM431946152.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/free-roblox-accounts-with-robux-that-work-not-banned-2021_GM431946152.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/rbx-gg-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/robux-hack-me_GM431946152.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/how-to-install-minecraft-for-free-on-ios_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_off00004fee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4FEE 24308 bytes
SHA-256: 7d5c1f35c61e41991f177c065f6e6f0335cf48ac8f62b32b66f49b602e3413fe
font_01_sfnt_off000087a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x87A5 19168 bytes
SHA-256: 2aefe189653e288cbe67d138bbfc20011991c5c17e595fe9cac661ff7eccdfa3

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