Malicious PDF — malware analysis report

Static analysis result for SHA-256 7910720023a3916a…

MALICIOUS

PDF

45.5 KB Created: 2021-05-11 18:01:51 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 12ae0a36f74786960a9404eb6da9d65e SHA-1: fe0b1d88df965f46745199f5f4d91673786452ec SHA-256: 7910720023a3916a67b684e95206d839a6f40158099588986a10f2a3e7562172
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple embedded links that point to known malicious redirectors and infrastructure, disguised with lures like 'free Robux' and game hacks. The ML classifier also flagged this PDF as malicious. The document body, though partially obfuscated, contains URLs that are consistent with the heuristic findings, suggesting a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9507

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/431946152/give-free-robux-game-hack In PDF document text
    • http://shinarb.by/images/earn-free-robux-for-roblox_GM431946152.pdfIn PDF document text
    • http://shinarb.by/images/how-to-download-minecraft-for-free-on-android_GM479516143.pdfIn PDF document text
    • http://shinarb.by/images/free-robux-quiz_GM431946152.pdfIn PDF document text
    • http://shinarb.by/images/www-free-robux_GM431946152.pdfIn PDF document text
    • http://shinarb.by/images/games-that-give-free-robux_GM431946152.pdfIn PDF document text
    • http://shinarb.by/images/minecraft-java-server-hosting-free_GM479516143.pdfIn PDF document text
    • http://shinarb.by/images/reddit-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://shinarb.by/images/best-minecraft-hacks_GM479516143.pdfIn PDF document text
    • http://shinarb.by/images/free-coin-coin-master_GM406889139.pdfIn PDF document text
    • http://shinarb.by/images/orewards-com-free-robux_GM431946152.pdfIn PDF document text
    • http://shinarb.by/images/robuxy-com-free-robux_GM431946152.pdfIn PDF document text
    • http://shinarb.by/images/roblox-prison-life-hack_GM431946152.pdfIn PDF document text
    • http://shinarb.by/images/coin-master-hack-apk-app_GM406889139.pdfIn PDF document text
    • http://shinarb.by/images/is-minecraft-earth-free_GM479516143.pdfIn PDF document text
    • http://shinarb.by/images/minecraft-pe-hacked-client-download_GM479516143.pdfIn PDF document text
    • http://shinarb.by/images/free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://shinarb.by/images/minecraft-bedrock-download-pc-free_GM479516143.pdfIn PDF document text
    • http://shinarb.by/images/can-you-really-hack-coin-master-ios_GM406889139.pdfIn PDF document text
    • http://shinarb.by/images/free-robux-app_GM431946152.pdfIn PDF document text
    • http://shinarb.by/images/free-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_003_off00004940.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4940 25932 bytes
SHA-256: 71d20ab173b0fcb84a5bbb24080c7e51a7e5f94b78820e37d29f4b180941214b
font_01_sfnt_off000085c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x85C6 2832 bytes
SHA-256: 77ae1c4cffa647a8fd533dfa4102e94364989f9e80b9cd131876e9d1005899a2
font_02_sfnt_off00008f77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8F77 18248 bytes
SHA-256: ea59f1cb8b041c2b832a039673c57edae81c360e33a5bea04888abdf43ec1c43

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