Malicious PDF — malware analysis report

Static analysis result for SHA-256 50f3dbd16779c766…

MALICIOUS

PDF

53.3 KB Created: 2021-06-03 09:19:20 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 92ff36c1a774f6e148e5f6ceda0e0ac4 SHA-1: 78263027e6db42e88f5b4ad69f6464f6b59cb3aa SHA-256: 50f3dbd16779c766b169c6710b73828eb8afb87fcca5c440cbf32d38b52bcd83
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links designed to lure users into clicking on what appears to be a 'free generator' or 'game hack'. These links redirect to malicious infrastructure, indicating a phishing or scam attempt. The presence of embedded URLs and the ML classifier's high confidence score support this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9616

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/431946152/free-robux-videos-game-hack In PDF document text
    • http://digilib.stimlog.ac.id/repository/roblox-admin-hack_GM431946152.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/roblox-heroes-online_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/how-to-get-free-robux-for-kids_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/how-to-hack-almost-any-game-roblox_GM431946152.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/free-spins-on-coin-master-link_GM406889139.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/coinmasterfreespins_GM406889139.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/coin-master-hack-tool-exe_GM406889139.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/roblox-hacks-com_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/roblox-free-bir_GM431946152.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/pokemon-go-free-64-bit_GM1094591345.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/tiktok-accounts-for-free_GM835599320.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/how-to-get-unlimited-robux-2021_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/promo-code-free-robux_GM431946152.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/free-robux-no-human-verification-and-no-survey_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/free-robux-group-payouts_GM431946152.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/coin-master-hack-tool-download_GM406889139.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/how-to-get-free-robux-hack-on-laptop_GM431946152.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/minecraft-for-free-games_GM479516143.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/free-coin-master-hacks-no-verification-or-survey_GM406889139.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/coin-master-ios-hack-download_GM406889139.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_off0000525c.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x525C 36520 bytes
SHA-256: 19c7e13bd441a9a5a095828607cac0888d6a5fadd573ed00b0d4e5dc84951424
font_01_sfnt_off0000a3e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA3E6 2872 bytes
SHA-256: 471b34484c3bee8d5bebbf3396bad215506385dbde547a2422db70e8efc075b4
font_02_sfnt_off0000ada0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xADA0 18444 bytes
SHA-256: 1ec21ed17295e3d49cd7a507c4ef3ee968e538ae560c82d8bcc555326bed268a

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