Malicious PDF — malware analysis report

Static analysis result for SHA-256 f15ec1f1aeb9474c…

MALICIOUS

PDF

44.4 KB Created: 2021-05-13 12:21:52 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: af9682b01a5aacefeeb36c9a60801806 SHA-1: de733d18d77488bac510a845dba9903eff39fdbb SHA-256: f15ec1f1aeb9474c82c2fec3a74bae25ce8190afc5d2210eecf96f7668a4efae
142 Risk Score

Malware Insights

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

The PDF document contains multiple lures related to game hacks and free currency for popular games like Coin Master and Roblox. It embeds several URLs that redirect to potentially malicious sites, indicated by the 'PDF_GAME_HACK_REDIRECT_LURE' and 'SE_SECRET_RECOVERY_LURE' heuristics. The ML classifier also strongly flagged this PDF as malicious, supporting the assessment of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9632

Heuristics 5

  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • 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.xyz/app/406889139/coin-master-admin-free-spins-game-hack PDF link annotation
    • http://mbbs.hr/files/freespinandcoinblogspotcom-2021-11-coinmasterfreespinandcoinlinkshtml_GM406889139.pdfIn PDF document text
    • https://mbbs.hr/files/free-spins-on-coin-master-link_GM406889139.pdfIn PDF document text
    • https://mbbs.hr/files/free-robux-master_GM431946152.pdfIn PDF document text
    • https://mbbs.hr/files/coin-master-level-3_GM406889139.pdfIn PDF document text
    • https://mbbs.hr/files/free-robux-discord_GM431946152.pdfIn PDF document text
    • http://mbbs.hr/files/minecraft-server-hacks_GM479516143.pdfIn PDF document text
    • https://mbbs.hr/files/fast-robux-online_GM431946152.pdfIn PDF document text
    • http://mbbs.hr/files/coin-master-cheats_GM406889139.pdfIn PDF document text
    • https://mbbs.hr/files/how-to-get-roblox-premium-for-free-2021_GM431946152.pdfIn PDF document text
    • http://mbbs.hr/files/can-u-get-free-robux_GM431946152.pdfIn PDF document text
    • http://mbbs.hr/files/minecraft-windows-10-edition-free-download_GM479516143.pdfIn PDF document text
    • http://mbbs.hr/files/easy-roblox-today_GM431946152.pdfIn PDF document text
    • http://mbbs.hr/files/best-free-robux-sites_GM431946152.pdfIn PDF document text
    • https://mbbs.hr/files/cool-free-roblox-outfits_GM431946152.pdfIn PDF document text
    • http://mbbs.hr/files/free-spin-link-for-coin-master-game_GM406889139.pdfIn PDF document text
    • https://mbbs.hr/files/free-spins-on-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://mbbs.hr/files/best-hack-for-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://mbbs.hr/files/free-spins-coin-master-app_GM406889139.pdfIn PDF document text
    • https://mbbs.hr/files/app-for-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://mbbs.hr/files/how-you-get-free-robux_GM431946152.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_003_off000047eb.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x47EB 25128 bytes
SHA-256: abfdf324d06546b3a3ca9c1fc19ea693152200dbf2d461b3e0160fd23a9076ce
font_01_sfnt_off00008148.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8148 2824 bytes
SHA-256: 381f6d859be141449dd645f7be1484d2a1cf49218dc471b402dae69eaa2b11d5
font_02_sfnt_off00008aeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8AEB 18320 bytes
SHA-256: 356ab8ba446e161f2af7577b22894ec36e2736224799e1ddbdd808f48a6a9d7e

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