Malicious PDF — malware analysis report

Static analysis result for SHA-256 78cc9a9555e86002…

MALICIOUS

PDF

33.9 KB Created: 2021-07-05 15:54:40 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 57ec155e9bd5d60350b12085d649be1a SHA-1: b85fe48b1b4770af5c60e69dc8a9deb99d01061e SHA-256: 78cc9a9555e86002d3f6e09454adb1b5219b3925416ffdde8a7c185b93111dd1
180 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains multiple links to known malicious redirectors and IP addresses, disguised as generators for popular games like Coin Master and Roblox. The document body explicitly mentions 'Coin Master Free Spins Promo Code' and 'CLICK HERE TO ACCESS COIN MASTER GENERATOR', indicating a social engineering lure. The presence of PDF-specific heuristics like 'PDF_GAME_HACK_REDIRECT_LURE' and 'PDF_MALICIOUS_REDIRECTOR_LINK' strongly suggests a malicious intent to redirect users to potentially harmful content or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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.
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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 http://netcdn.tw/app/406889139/coin-master-free-spins-promo-code-game-hack In PDF document text
    • http://36.94.36.7/elib/repository/free-robux-generator-no-human-verification-2021_GM431946152.pdfPDF link annotation
    • http://36.94.36.7/elib//repository/100-hack-coin-master_GM406889139.pdfIn PDF document text
    • http://36.94.36.7/elib//repository/robloxheroxyz-free-robux_GM431946152.pdfIn PDF document text
    • http://36.94.36.7/elib/repository/earn-robux-today-earn-robux-today_GM431946152.pdfIn PDF document text
    • http://36.94.36.7/elib/repository/best-free-spin-app-for-coin-master_GM406889139.pdfIn PDF document text
    • http://36.94.36.7/elib/repository/free-exploits-for-roblox_GM431946152.pdfIn PDF document text
    • http://36.94.36.7/elib/repository/coin-master-hack-download-android_GM406889139.pdfIn PDF document text
    • http://36.94.36.7/elib//repository/how-to-hack-roblox-games_GM431946152.pdfIn PDF document text
    • http://36.94.36.7/elib/repository/free-robux-groups-2021_GM431946152.pdfIn PDF document text
    • http://36.94.36.7/elib//repository/coin-master-free-coins--spins_GM406889139.pdfIn PDF document text
    • http://36.94.36.7/elib/repository/coin-master-game-hacking_GM406889139.pdfIn PDF document text
    • http://36.94.36.7/elib/repository/block-best-robux_GM431946152.pdfIn PDF document text
    • http://36.94.36.7/elib/repository/black-pants-roblox-free_GM431946152.pdfIn PDF document text
    • http://36.94.36.7/elib/repository/free-download-roblox-infinite-jump-real_GM431946152.pdfIn PDF document text
    • http://36.94.36.7/elib//repository/free-spins-on-coin-master-link_GM406889139.pdfIn PDF document text
    • http://36.94.36.7/elib/repository/code-get-free-robux-roblox_GM431946152.pdfIn PDF document text
    • http://36.94.36.7/elib//repository/free-foxy-food-coin-master_GM406889139.pdfIn PDF document text
    • http://36.94.36.7/elib//repository/getrobux-ninja_GM431946152.pdfIn PDF document text
    • http://36.94.36.7/elib//repository/free-roblox-premium_GM431946152.pdfIn PDF document text
    • http://36.94.36.7/elib//repository/coin-master-free-download_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
font_00_sfnt_off00002e2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2E2A 22600 bytes
SHA-256: ff73cf734fa6846e56d59896680b06390ff165554dc9eacaac20e03014164ed7
font_01_sfnt_off0000609e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x609E 18760 bytes
SHA-256: f19908f223f6d81612d6a2bf6f73a33e849f8235d54350b1f471ed781f00ccd8

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