Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2157a9d9d5cac80…

MALICIOUS

PDF

41.7 KB Created: 2021-05-15 11:08:35 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 7ba5ec9d3700d4d4e61c3bf17de3ee92 SHA-1: 3088c2681c5d7133993ed0a29b8d2f48828c06f5 SHA-256: f2157a9d9d5cac80b23d2e595bfb4799fd34fe1cd1e8a712b902cd96d3e4dd5c
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links that redirect to malicious infrastructure, specifically promoting 'free generator / game hack' lures. The document body and embedded URLs strongly suggest a phishing or scam attempt designed to trick users into visiting potentially harmful sites. No scripts were extracted, but the PDF's structure and embedded links are indicative of a social engineering attack.

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/406889139/todays-free-spin-and-coin-links-game-hack In PDF document text
    • http://ghhs.com.my/images/free-robux-safe_GM431946152.pdfIn PDF document text
    • http://ghhs.com.my/images/coin-master-game-2021-free-spin-link_GM406889139.pdfIn PDF document text
    • http://ghhs.com.my/images/irobux-com-redeem_GM431946152.pdfIn PDF document text
    • http://ghhs.com.my/images/free-minecraft-skins_GM479516143.pdfIn PDF document text
    • http://ghhs.com.my/images/free-robux-2021-no-verification_GM431946152.pdfIn PDF document text
    • http://ghhs.com.my/images/free-robux-master_GM431946152.pdfIn PDF document text
    • http://ghhs.com.my/images/how-to-get-free-coins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://ghhs.com.my/images/coin-master-free-spins-2021_GM406889139.pdfIn PDF document text
    • http://ghhs.com.my/images/free-robux-websites-2021_GM431946152.pdfIn PDF document text
    • http://ghhs.com.my/images/coin-master-free-spins-coins_GM406889139.pdfIn PDF document text
    • http://ghhs.com.my/images/real-free-robux-codes_GM431946152.pdfIn PDF document text
    • http://ghhs.com.my/images/descargar-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://ghhs.com.my/images/free-robux-generator_GM431946152.pdfIn PDF document text
    • http://ghhs.com.my/images/free-hair-roblox-boy_GM431946152.pdfIn PDF document text
    • http://ghhs.com.my/images/how-to-get-free-robux-without-downloading-anything_GM431946152.pdfIn PDF document text
    • http://ghhs.com.my/images/coin-master-hack-apk-download-2021_GM406889139.pdfIn PDF document text
    • http://ghhs.com.my/images/coin-master-hack-app-ios-download_GM406889139.pdfIn PDF document text
    • http://ghhs.com.my/images/free-coins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://ghhs.com.my/images/free-robux-generator-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://ghhs.com.my/images/coin-master-gold-cards-free-2021_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_off000048b3.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x48B3 24352 bytes
SHA-256: c6fb52bfb06d101ed4445a694e026351e3ceb9a06440453ea0121899bd144417
font_01_sfnt_off000080a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x80A2 18304 bytes
SHA-256: fe41b9c6f73a07cbbf88dd054bef46cc881cfc19b14a93a0ff48235cedd50557

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