Malicious PDF — malware analysis report

Static analysis result for SHA-256 d55ea234eced5a11…

MALICIOUS

PDF

34.5 KB Created: 2021-06-30 10:47:39 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 40cf27da5747106b73129201af4c1e3b SHA-1: df1f1a12692e642ac3a3c004b6f6784f8f5f1a65 SHA-256: d55ea234eced5a118732f3af2956c58415fa5638c2ba9a2c94a722ff9d6ee898
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links designed to lure users into clicking on them by promising free game hacks and currency. These links ultimately redirect to malicious infrastructure, such as http://netcdn.co/app/431946152/roblox-hack-client-android-game-hack. The presence of a visual download button further supports the deceptive nature of the document. No scripts were extracted, but the extensive link farm indicates a phishing or scam attempt.

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.
  • 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 http://netcdn.co/app/431946152/roblox-hack-client-android-game-hack In PDF document text
    • http://perpustakaan.dutadharma.ac.id/repository/how-to-get-actually-free-robux_GM431946152.pdfIn PDF document text
    • http://perpustakaan.dutadharma.ac.id/repository/can-i-get-robux-for-free_GM431946152.pdfIn PDF document text
    • http://perpustakaan.dutadharma.ac.id/repository/coin-master-free-spins-link-hack_GM406889139.pdfIn PDF document text
    • http://perpustakaan.dutadharma.ac.id/repository/op-rewards-free-robux_GM431946152.pdfIn PDF document text
    • http://perpustakaan.dutadharma.ac.id/repository/free-robux-no-gift-card_GM431946152.pdfIn PDF document text
    • http://perpustakaan.dutadharma.ac.id/repository/hack-coin-master-free_GM406889139.pdfIn PDF document text
    • http://perpustakaan.dutadharma.ac.id/repository/coin-master-free-spins-link-today-new_GM406889139.pdfIn PDF document text
    • http://perpustakaan.dutadharma.ac.id/repository/how-to-get-java-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://perpustakaan.dutadharma.ac.id/repository/coin-master-free-spins-link-2021-today_GM406889139.pdfIn PDF document text
    • http://perpustakaan.dutadharma.ac.id/repository/pubg-uc-hack_GM1330123889.pdfIn PDF document text
    • http://perpustakaan.dutadharma.ac.id/repository/free-group-roblox_GM431946152.pdfIn PDF document text
    • http://perpustakaan.dutadharma.ac.id/repository/100-free-spins-coin-master-link_GM406889139.pdfIn PDF document text
    • http://perpustakaan.dutadharma.ac.id/repository/free-premium-roblox_GM431946152.pdfIn PDF document text
    • http://perpustakaan.dutadharma.ac.id/repository/how-to-get-free-robux-in-promo-code-2021-april_GM431946152.pdfIn PDF document text
    • http://perpustakaan.dutadharma.ac.id/repository/roblox-hack-no-recoil-script_GM431946152.pdfIn PDF document text
    • http://perpustakaan.dutadharma.ac.id/repository/how-to-get-more-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://perpustakaan.dutadharma.ac.id/repository/prison-life-roblox-hacks_GM431946152.pdfIn PDF document text
    • http://perpustakaan.dutadharma.ac.id/repository/como-hackear-roblox-2021_GM431946152.pdfIn PDF document text
    • http://perpustakaan.dutadharma.ac.id/repository/apps-roblox-hacks_GM431946152.pdfIn PDF document text
    • http://perpustakaan.dutadharma.ac.id/repository/how-to-get-free-robux-com_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_off000030d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x30D8 22036 bytes
SHA-256: 30632acaff104d654fe2464f5552a7bb8056935b56940f7b135cb3bdf6ff1df1
font_01_sfnt_off0000619d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x619D 19052 bytes
SHA-256: 1569e16a1f605fa6304a47337c430e99f3e5a98a543b61a940f89d51fd8e7a7b

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