Malicious PDF — malware analysis report

Static analysis result for SHA-256 344e2fdad604c75b…

MALICIOUS

PDF

46.2 KB Created: 2021-06-03 23:12:21 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 4775d54b1554bec9aebe16bac5f30246 SHA-1: 179b38d563f537b137232bea795f6fd6da1dcd4f SHA-256: 344e2fdad604c75b08f62ea258e2ac3a30d7f74f47ec7b7e6ee4f218407c27bb
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many of which are SEO-optimized and point to game hack generators and freebies, indicating a link farm or phishing attempt. The primary URL, https://netcdn.online/app/406889139/coin-master-free-daily-spins-game-hack, is directly associated with a 'game hack' lure. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9797

Heuristics 5

  • 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.
  • PDF links to a 'free generator / game hack' redirector high 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.
  • 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
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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/406889139/coin-master-free-daily-spins-game-hack PDF link annotation
    • http://perpus.stmik-im.ac.id/repository/free-coin-master-gifts_GM406889139.pdfIn PDF document text
    • http://perpus.stmik-im.ac.id/repository/roblox-font-free_GM431946152.pdfIn PDF document text
    • http://perpus.stmik-im.ac.id/repository/coin-master-hack-app-ios-download_GM406889139.pdfIn PDF document text
    • http://perpus.stmik-im.ac.id/repository/real-free-robux-codes_GM431946152.pdfIn PDF document text
    • http://perpus.stmik-im.ac.id/repository/daily-coin-master-free-link_GM406889139.pdfIn PDF document text
    • http://perpus.stmik-im.ac.id/repository/free-spin-coin-master-hacktoman_GM406889139.pdfIn PDF document text
    • http://perpus.stmik-im.ac.id/repository/is-roblox-free-on-pc_GM431946152.pdfIn PDF document text
    • http://perpus.stmik-im.ac.id/repository/free-game-packs-for-coin-master_GM406889139.pdfIn PDF document text
    • http://perpus.stmik-im.ac.id/repository/sites-for-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://perpus.stmik-im.ac.id/repository/free-spins-for-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://perpus.stmik-im.ac.id/repository/free-coins-for-planet-master-game_GM406889139.pdfIn PDF document text
    • http://perpus.stmik-im.ac.id/repository/minecraft-java-edition-download-free_GM479516143.pdfIn PDF document text
    • http://perpus.stmik-im.ac.id/repository/free-free-robux_GM431946152.pdfIn PDF document text
    • http://perpus.stmik-im.ac.id/repository/coin-master-hack-apk-free-download_GM406889139.pdfIn PDF document text
    • http://perpus.stmik-im.ac.id/repository/free-robux-picture_GM431946152.pdfIn PDF document text
    • http://perpus.stmik-im.ac.id/repository/how-to-hack-someone-on-roblox_GM431946152.pdfIn PDF document text
    • http://perpus.stmik-im.ac.id/repository/free-mod-apk-coin-master_GM406889139.pdfIn PDF document text
    • http://perpus.stmik-im.ac.id/repository/roblox-e-free_GM431946152.pdfIn PDF document text
    • http://perpus.stmik-im.ac.id/repository/how-to-hack-roblox-accounts_GM431946152.pdfIn PDF document text
    • http://perpus.stmik-im.ac.id/repository/how-to-get-more-spins-on-coin-master_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_off00004eac.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4EAC 25212 bytes
SHA-256: 7876ca9665174ad691917bd21293a96372fa2550d5798d11f856f23e55b88200
font_01_sfnt_off000087ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x87ED 2840 bytes
SHA-256: 30dce2b9c1950da345d7fed8f00c38887adfa2f2ddecc31775af2315e819ac37
font_02_sfnt_off000091a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x91A0 18308 bytes
SHA-256: 5c3cefeee4a209382fad51155f4ab19c665f35dca270fe96ae1b58d23c3d8f95

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