Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9108632c1690816…

MALICIOUS

PDF

43.0 KB Created: 2021-05-13 18:03:43 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 95931a9eba199634458bc3e73bce4a4f SHA-1: b133683490c4ff12aa5150059501a8c29b4d6229 SHA-256: b9108632c16908160b32f6814481a6184f3bcc94c7481d2748b0c6cb2e8e5a76
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to redirector infrastructure, specifically advertising 'game hacks' and 'free Robux' to lure users. The document body and extracted URLs strongly suggest a phishing or scam attempt, likely to lead users to malicious sites or download further malware. No scripts were extracted, but the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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/how-to-hack-to-get-robux-game-hack In PDF document text
    • http://posterprintshop.nl/images/coin-master-mod_GM406889139.pdfIn PDF document text
    • http://posterprintshop.nl/images/coin-master-free-spins-link-download-apk_GM406889139.pdfIn PDF document text
    • http://posterprintshop.nl/images/free-robux-codes-no-verification_GM431946152.pdfIn PDF document text
    • http://posterprintshop.nl/images/free-robux-no-survey-or-human-verification_GM431946152.pdfIn PDF document text
    • http://posterprintshop.nl/images/best-roblox-hacks_GM431946152.pdfIn PDF document text
    • http://posterprintshop.nl/images/roblox-generator-com_GM431946152.pdfIn PDF document text
    • http://posterprintshop.nl/images/free-coin-master-glitches_GM406889139.pdfIn PDF document text
    • http://posterprintshop.nl/images/free-coins-coin-master_GM406889139.pdfIn PDF document text
    • http://posterprintshop.nl/images/how-to-get-free-spins-on-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://posterprintshop.nl/images/pasos-para-hackear-coins-master_GM406889139.pdfIn PDF document text
    • http://posterprintshop.nl/images/coin-master-hacks-to-get-spins_GM406889139.pdfIn PDF document text
    • http://posterprintshop.nl/images/free-vip-server-roblox_GM431946152.pdfIn PDF document text
    • http://posterprintshop.nl/images/coin-master-hack-spin-160-pro_GM406889139.pdfIn PDF document text
    • http://posterprintshop.nl/images/rbx-robux_GM431946152.pdfIn PDF document text
    • http://posterprintshop.nl/images/how-to-get-free-pets-in-adopt-me-roblox_GM431946152.pdfIn PDF document text
    • http://posterprintshop.nl/images/free-coins_GM406889139.pdfIn PDF document text
    • http://posterprintshop.nl/images/whats-robux_GM431946152.pdfIn PDF document text
    • http://posterprintshop.nl/images/http-appsmob-info-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://posterprintshop.nl/images/how-can-i-get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://posterprintshop.nl/images/how-to-get-free-robux-on-ipad_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_off0000471f.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x471F 26388 bytes
SHA-256: 04316bd59f837a1765be86b5b3c1b92d4f61b107e9702de893401e660d353ab7
font_01_sfnt_off000084ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x84AE 18516 bytes
SHA-256: e2a97b64806b22db336191728b408e5b7179700d4ee5fd3b4b30addea2706a3c

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