Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc3146a0557706d1…

MALICIOUS

PDF

34.1 KB Created: 2021-07-04 10:26:49 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 6033816fcab3316d5e0e600777a62421 SHA-1: 4ce6b5755b71bf477da2c078ee08952f433f2b24 SHA-256: fc3146a0557706d174ac3f680689f811855aeb8c9bad213dff8d9792ec9a866a
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links, including one identified as a malicious redirector infrastructure pointing to 'http://netcdn.tw/app/406889139/level-coin-game-hack'. This lure is presented as a 'free generator / game hack', aiming to trick users into clicking. The presence of a visual download button further supports the deceptive nature of the document. No scripts were extracted, but the primary attack pattern involves social engineering via deceptive links.

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.tw/app/406889139/level-coin-game-hack In PDF document text
    • http://smpn1sda.sch.id/slims/repository/free-minecraft-premium-account_GM479516143.pdfIn PDF document text
    • http://smpn1sda.sch.id/slims/repository/minecraft-windows-10-free-with-java_GM479516143.pdfIn PDF document text
    • http://smpn1sda.sch.id/slims/repository/free-games-at-roblox-com-htm_GM431946152.pdfIn PDF document text
    • http://smpn1sda.sch.id/slims/repository/minecraft-nintendo-switch-digital-code-free_GM479516143.pdfIn PDF document text
    • http://smpn1sda.sch.id/slims/repository/coin-master-free-spins-today-daily-links_GM406889139.pdfIn PDF document text
    • http://smpn1sda.sch.id/slims/repository/the-conquerors-roblox-cheats_GM431946152.pdfIn PDF document text
    • http://smpn1sda.sch.id/slims/repository/free-roblox-executor-no-key_GM431946152.pdfIn PDF document text
    • http://smpn1sda.sch.id/slims/repository/get-me-free-robux_GM431946152.pdfIn PDF document text
    • http://smpn1sda.sch.id/slims/repository/coin-master-free-spins-links-app_GM406889139.pdfIn PDF document text
    • http://smpn1sda.sch.id/slims/repository/how-do-you-hack-a-roblox-server_GM431946152.pdfIn PDF document text
    • http://smpn1sda.sch.id/slims/repository/roblox-club-free-robux_GM431946152.pdfIn PDF document text
    • http://smpn1sda.sch.id/slims/repository/hack-coin-master-apk-download_GM406889139.pdfIn PDF document text
    • http://smpn1sda.sch.id/slims/repository/roblox-promo-codes-for-free-robux_GM431946152.pdfIn PDF document text
    • http://smpn1sda.sch.id/slims/repository/robux-hack-no-human-verification_GM431946152.pdfIn PDF document text
    • http://smpn1sda.sch.id/slims/repository/how-to-get-free-robux-without-verifying-2021_GM431946152.pdfIn PDF document text
    • http://smpn1sda.sch.id/slims/repository/hack-people-on-roblox_GM431946152.pdfIn PDF document text
    • http://smpn1sda.sch.id/slims/repository/free-robux-for-free_GM431946152.pdfIn PDF document text
    • http://smpn1sda.sch.id/slims/repository/robux-hack-free-no-verify_GM431946152.pdfIn PDF document text
    • http://smpn1sda.sch.id/slims/repository/free-robux-no-survey_GM431946152.pdfIn PDF document text
    • http://smpn1sda.sch.id/slims/repository/free-robux-bc-only_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
stream_002_off00003064.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3064 22888 bytes
SHA-256: 600118673619063e8b2a790421bdf537dd3a0140fc410ed76f3e6c3bd0535e6e
font_01_sfnt_off000063b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x63B5 17916 bytes
SHA-256: 9aebee245f83c56423f7887c8965915c77907da1f54e79bebddd47c8c94ab0ef

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