Malicious PDF — malware analysis report

Static analysis result for SHA-256 b94dee8f5b19efb5…

MALICIOUS

PDF

35.5 KB Created: 2021-07-06 03:16:31 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: ee049934bce01255b41cd242f649451e SHA-1: 9cb69f98a287e727f19b68f72417e476aa62515d SHA-256: b94dee8f5b19efb538684a929c65f7ed1ca47465b8e9b736e6c854d2ed3589bb
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains numerous links to external websites, many of which are hosted on a link farm. The document body and heuristics indicate a lure for game hacks and free in-game currency, suggesting a phishing or scam attempt. The primary malicious URL identified is http://netcdn.tw/app/406889139/free-spin-sites-for-coin-master-game-hack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://netcdn.tw/app/406889139/free-spin-sites-for-coin-master-game-hack PDF link annotation
    • http://www.library.umbjm.ac.id/repository/how-to-get-robux-for-free-no-scam_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/free-robux-with-no-verification_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/coin-master-spins_GM406889139.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/how-to-get-free-robux-on-computer-fast-2021_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/best-free-spin-app-for-coin-master_GM406889139.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/troll-hack-script-roblox_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/coin-master-game-hack-app-download_GM406889139.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/free-coin-master-spins-link_GM406889139.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/how-to-hack-golden-card-in-coin-master_GM406889139.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/coin-master-time-speed-hack_GM406889139.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/try-minecraft-free_GM479516143.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/daily-free-spin-coin-master-link_GM406889139.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/free-robux-for-samsung-s3_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/tiktok-for-free-install_GM835599320.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/coin-master-hack-online-pc_GM406889139.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/minecraft-life-hacks_GM479516143.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/rbx-free-robux_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/free-robux-accounts_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/coin-master-hack-spins-and-coins-unlimited-free-download_GM406889139.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/minecraft-xbox-360-free-download-code_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
stream_002_off000032a1.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x32A1 23672 bytes
SHA-256: b6bdedb0dbe26f544450187b4549c4870c1e36d7690fdc300fbbf7dc4b95c8e8
font_01_sfnt_off00006875.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6875 18176 bytes
SHA-256: 2eae8e3987636c9fc65cc5a2ed4994fbbe9ecab828aa32e9f35a6bee3d4dd856

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