Malicious PDF — malware analysis report

Static analysis result for SHA-256 25be9a1de70e7f33…

MALICIOUS

PDF

43.1 KB Created: 2021-05-19 08:07:39 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 2e0617c71ed10cfbaef24b3d4f68f8fb SHA-1: 7c5ae59e0a7ec4f12c11f2153b643d49f6853985 SHA-256: 25be9a1de70e7f333f9ef7bb99a06efdd49815fca5662e7304f4777265b3e70c
180 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to websites offering 'free Robux' or game hacks, which are common lures for phishing and scams. The heuristic firings indicate the PDF links to known malicious redirector infrastructure and is flagged by an ML classifier. Although no scripts were extracted, the document body and embedded URLs strongly suggest a social engineering attack aimed at tricking users into visiting malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 5

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) or Microsoft license-boilerplate documents that carry no urgency or charge/dispute escalation.
  • 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/how-to-get-free-robux-easy-no-download-game-hack In PDF document text
    • http://playmoorecello.com/images/toolbox-for-minecraft-pe-ios_GM479516143.pdfIn PDF document text
    • http://playmoorecello.com/images/bloxpage-free-robux_GM431946152.pdfIn PDF document text
    • http://playmoorecello.com/images/coin-master-daily-gift-free-spins-and-coins_GM406889139.pdfIn PDF document text
    • http://playmoorecello.com/images/free-robux-only-1-step_GM431946152.pdfIn PDF document text
    • http://playmoorecello.com/images/coin-master-free-spins-hack-2021_GM406889139.pdfIn PDF document text
    • http://playmoorecello.com/images/free-robux-only-username-no-human-verification_GM431946152.pdfIn PDF document text
    • http://playmoorecello.com/images/robux-com-roblox_GM431946152.pdfIn PDF document text
    • http://playmoorecello.com/images/pig-master-coin-master-free-spin_GM406889139.pdfIn PDF document text
    • http://playmoorecello.com/images/no-scam-free-robux_GM431946152.pdfIn PDF document text
    • http://playmoorecello.com/images/free-roblox-accounts-with-robux-2021_GM431946152.pdfIn PDF document text
    • http://playmoorecello.com/images/earn-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://playmoorecello.com/images/how-to-get-free-robux-codes-2021_GM431946152.pdfIn PDF document text
    • http://playmoorecello.com/images/how-to-hack-roblox-accounts-on-phone_GM431946152.pdfIn PDF document text
    • http://playmoorecello.com/images/how-to-get-minecraft-bedrock-for-free-with-java_GM479516143.pdfIn PDF document text
    • http://playmoorecello.com/images/robux-com-free_GM431946152.pdfIn PDF document text
    • http://playmoorecello.com/images/moon-active-games_GM406889139.pdfIn PDF document text
    • http://playmoorecello.com/images/roblox-hack-download_GM431946152.pdfIn PDF document text
    • http://playmoorecello.com/images/minecraft-net-download-free_GM479516143.pdfIn PDF document text
    • http://playmoorecello.com/images/how-to-get-free-roblox-hair_GM431946152.pdfIn PDF document text
    • http://playmoorecello.com/images/free-25-spins-coin-master-links_GM406889139.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_off000049e6.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x49E6 25596 bytes
SHA-256: ed00a5f3da034595f1e03d1fcb44840709efe10a6defe4cb7fe0afd685984ac1
font_01_sfnt_off00008350.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8350 19108 bytes
SHA-256: 7bc61c49a0b734df4d56b9cb8c894117daf111bfa68c773dcc76edca8f070452

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