Malicious PDF — malware analysis report

Static analysis result for SHA-256 f15fbed1149cc078…

MALICIOUS

PDF

49.0 KB Created: 2021-05-11 01:08:48 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 2c31059fb7e874bc91f7200f7d2fbca1 SHA-1: e33afbcc36e9b6a173cb3b710d968ba8278a058b SHA-256: f15fbed1149cc078d963717f68d3640c999fd8156ebd8b7ed3a447a23571c952
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to known malicious redirectors, specifically promoting 'free coins' and 'game hacks' for popular games. The primary redirector URL is https://netcdn.xyz/app/406889139/free-coins-coin-master-iphone-game-hack, which is likely used to deliver a secondary payload or lead to a phishing page. The document body, though partially corrupted, contains similar lure text and URLs, reinforcing the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9228

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 https://netcdn.xyz/app/406889139/free-coins-coin-master-iphone-game-hack In PDF document text
    • http://opac.stiesa.ac.id/repository/cheating-hacks-for-coin-master_GM406889139.pdfIn PDF document text
    • http://opac.stiesa.ac.id/repository/how-to-download-minecraft-for-free-on-iphone_GM479516143.pdfIn PDF document text
    • http://opac.stiesa.ac.id/repository/free-robux-generator-for-roblox-2021_GM431946152.pdfIn PDF document text
    • http://opac.stiesa.ac.id/repository/how-to-get-daily-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://opac.stiesa.ac.id/repository/free-robux-codes-2021-not-used_GM431946152.pdfIn PDF document text
    • http://opac.stiesa.ac.id/repository/actual-free-robux_GM431946152.pdfIn PDF document text
    • http://opac.stiesa.ac.id/repository/how-to-get-free-tokens-in-minecraft-ps4_GM479516143.pdfIn PDF document text
    • http://opac.stiesa.ac.id/repository/free-robux-codes-no-verification_GM431946152.pdfIn PDF document text
    • http://opac.stiesa.ac.id/repository/free-robux-real_GM431946152.pdfIn PDF document text
    • http://opac.stiesa.ac.id/repository/coin-master-hack-2021-ios-download_GM406889139.pdfIn PDF document text
    • http://opac.stiesa.ac.id/repository/wurst-client-112-2_GM479516143.pdfIn PDF document text
    • http://opac.stiesa.ac.id/repository/free-spins-and-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://opac.stiesa.ac.id/repository/robux-today_GM431946152.pdfIn PDF document text
    • http://opac.stiesa.ac.id/repository/roblox-hack-unlimited-robux_GM431946152.pdfIn PDF document text
    • http://opac.stiesa.ac.id/repository/how-to-get-free-robux-without-email_GM431946152.pdfIn PDF document text
    • http://opac.stiesa.ac.id/repository/coin-master-hacks-2021_GM406889139.pdfIn PDF document text
    • http://opac.stiesa.ac.id/repository/coin-master-free-coins-and-spins-2021_GM406889139.pdfIn PDF document text
    • http://opac.stiesa.ac.id/repository/minecraft-pocket-edition-free-apk_GM479516143.pdfIn PDF document text
    • http://opac.stiesa.ac.id/repository/coin-master-free-spins-cheat_GM406889139.pdfIn PDF document text
    • http://opac.stiesa.ac.id/repository/free-robux-generator-com-roblox-hack_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_off00004c29.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4C29 29924 bytes
SHA-256: a87723bc5109591c9879f50ee19f66576ebf43ebfb4d92e75c21da88a1b6e47e
font_01_sfnt_off00008c0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8C0B 7332 bytes
SHA-256: d811e0aca85f3b94c42cd1240eec68b8eb378f3d8be5e408d3f6abd0f11f834d
font_02_sfnt_off00009e24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9E24 18052 bytes
SHA-256: 99dbb6b6b1c2666a4e7c95b3e8e09f0f63bf7a1f88354efaa1e52c2fabb98515

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