Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9e3bb44540334d2…

MALICIOUS

PDF

42.2 KB Created: 2021-05-19 19:52:17 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 57f381742f0629db7f43ed30c42e9ada SHA-1: ed07595c1e11f29bce6c44b276c2883d6d0d1ccd SHA-256: b9e3bb44540334d2316b2da16079ac52504e67cf27eaa4ea7b7fab433d432edf
200 Risk Score

Malware Insights

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

This PDF document is designed as a credential phishing lure, impersonating Facebook to trick users into clicking links that promise game hacks and free currency. The primary malicious URL, https://netcdn.xyz/app/406889139/best-site-for-free-coin-master-free-spin-link-game-hack, is presented as a 'generator' or 'hack' site, leveraging the user's interest in popular games. The document's structure and embedded links strongly suggest an attempt to exploit user interest in gaming for malicious purposes, likely leading to credential theft or further malware delivery.

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.
  • Brand-impersonation credential phishing lure high SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: call-to-action link host does not match the impersonated brand: https://netcdn.xyz/app/406889139/best-site-for-free-coin-master-free-spin-link-game-hack.
  • 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/best-site-for-free-coin-master-free-spin-link-game-hack In PDF document text
    • http://ycstamping.com.tw/image/data/files/roblox40com-robux_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/are-there-any-coin-master-hacks-that-actually-work_GM406889139.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/how-can-you-get-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/reddit-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/minecraft-tower-defense-2-hacked_GM479516143.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/roblox-free-robux_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/coin-master-free-spin-game_GM406889139.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/ear-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/free-robux-without-survey_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/coin-master-hack-programers_GM406889139.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/coin-master-daily-free-spins-link_GM406889139.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/how-to-get-minecraft-for-free-on-tablet_GM479516143.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/free-spin-link-coin-master-today_GM406889139.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/free-roblox-card-codes_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/you-promised-my-son-free-robux_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/coin-master-hack-spins-and-coins-unlimited-free_GM406889139.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/robloxbux-us-generator_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/roblox-script-hack_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/cm-spin-link_GM406889139.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/free-robux-no-verification-at-all_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_off000049c3.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x49C3 25300 bytes
SHA-256: 7320e3727e1cbd7d15a0a8b2e0aa76c263e6ce9abaeb5512e1e62c0d089b2dad
font_01_sfnt_off000082b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x82B8 18272 bytes
SHA-256: ca1d5c85fdffad6772495688e388105cc3e45c07940918e965146369a91d2d3c

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