Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b52b5132f4a9e2c…

MALICIOUS

PDF

43.4 KB Created: 2021-05-19 03:08:19 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 02aeed3ea7b3e8e55a4e7a21dcd25ad7 SHA-1: 0ad4d7df5124c58a7598eb9f5243b7e95254fb3d SHA-256: 4b52b5132f4a9e2cdd34fe7017ad6e17c77acc04b0f47f5625d34cfac5a46b73
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to external websites that are flagged as malicious redirectors, specifically advertising "free Robux" or "game hacks." The document body, though partially corrupted, contains similar lures and references to the malicious URL. The presence of these links and the heuristic firings strongly suggest a phishing or scam attempt designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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://www.herbasacra.gr/images/spin-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://www.herbasacra.gr/images/get-free-robux-now_GM431946152.pdfIn PDF document text
    • http://www.herbasacra.gr/images/coin-master-spins-hack-2021_GM406889139.pdfIn PDF document text
    • http://www.herbasacra.gr/images/coin-master-hack-without-verification_GM406889139.pdfIn PDF document text
    • http://www.herbasacra.gr/images/free-robux-no-verify-2021_GM431946152.pdfIn PDF document text
    • http://www.herbasacra.gr/images/ways-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://www.herbasacra.gr/images/coin-master-free-spins-link-blogspot_GM406889139.pdfIn PDF document text
    • http://www.herbasacra.gr/images/how-to-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://www.herbasacra.gr/images/minecraft-free-school_GM479516143.pdfIn PDF document text
    • http://www.herbasacra.gr/images/free-robux-live_GM431946152.pdfIn PDF document text
    • http://www.herbasacra.gr/images/roblox-hack-codes_GM431946152.pdfIn PDF document text
    • http://www.herbasacra.gr/images/hack-coins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://www.herbasacra.gr/images/how-to-get-free-spins-on-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://www.herbasacra.gr/images/coin-master-free-spin-redeem-code_GM406889139.pdfIn PDF document text
    • http://www.herbasacra.gr/images/free-robux-no-human-verification-and-no-survey_GM431946152.pdfIn PDF document text
    • http://www.herbasacra.gr/images/free-daily-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://www.herbasacra.gr/images/coin-mster-free_GM406889139.pdfIn PDF document text
    • http://www.herbasacra.gr/images/robux-com-free_GM431946152.pdfIn PDF document text
    • http://www.herbasacra.gr/images/free-robux-legit_GM431946152.pdfIn PDF document text
    • http://www.herbasacra.gr/images/free-robux-no-human-verification-or-survey-2021_GM431946152.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_003_off00004a45.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4A45 26868 bytes
SHA-256: 233e16a25b1312f12eb5982f3926c7bc57f54bd7eef7fa453ddf6e6e1ca3f716
font_01_sfnt_off000087a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x87A0 18248 bytes
SHA-256: ea59f1cb8b041c2b832a039673c57edae81c360e33a5bea04888abdf43ec1c43

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