Malicious PDF — malware analysis report

Static analysis result for SHA-256 81809f39ea4bd9ec…

MALICIOUS

PDF

44.5 KB Created: 2021-06-09 16:48:05 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-17
MD5: ca64f078b424397d6af090a5513f5947 SHA-1: c50426aec9b25a08d688fdbb178e728a20ce4a11 SHA-256: 81809f39ea4bd9ec3579b82dc0446566dbfe2b29940e3963d73265a7cebfd2ed
162 Risk Score

Malware Insights

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

This PDF document is designed as a lure, employing game hack and free generator themes to entice users. It contains a mass of external links, forming a link farm, with many pointing to other SEO-optimized PDFs on the 'ansacare.com' domain. The primary URL, 'https://netcdn.tw/app/431946152/roblox-jailbreak-infinite-money-hack-game-hack', likely serves as a redirector to further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

Heuristics 6

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • PDF links to a 'free generator / game hack' redirector high 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.
  • 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) 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
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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.tw/app/431946152/roblox-jailbreak-infinite-money-hack-game-hack PDF link annotation
    • http://ansacare.com/images/coin-master-free-spins-and-free-coins_GM406889139.pdfIn PDF document text
    • http://ansacare.com/images/how-to-get-free-faces-on-roblox-ipad_GM431946152.pdfIn PDF document text
    • http://ansacare.com/images/wurst-client-download_GM479516143.pdfIn PDF document text
    • http://ansacare.com/images/legit-coin-master-hack-no-human-verification_GM406889139.pdfIn PDF document text
    • http://ansacare.com/images/free-coins-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://ansacare.com/images/hack-coin-master-apk-358_GM406889139.pdfIn PDF document text
    • http://ansacare.com/images/coin-master-latest-version-hack_GM406889139.pdfIn PDF document text
    • http://ansacare.com/images/how-to-hack-roblox-accounts-on-phone_GM431946152.pdfIn PDF document text
    • http://ansacare.com/images/how-to-get-more-robux_GM431946152.pdfIn PDF document text
    • http://ansacare.com/images/how-to-get-free-robux-gift-cards_GM431946152.pdfIn PDF document text
    • http://ansacare.com/images/free-robux-generator-no-verification_GM431946152.pdfIn PDF document text
    • http://ansacare.com/images/coin-master-free-soins_GM406889139.pdfIn PDF document text
    • http://ansacare.com/images/coin-master-free-2021-spin-link_GM406889139.pdfIn PDF document text
    • http://ansacare.com/images/roblox-speed-hack_GM431946152.pdfIn PDF document text
    • http://ansacare.com/images/roblox-robux-hack_GM431946152.pdfIn PDF document text
    • http://ansacare.com/images/free-spins-coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • http://ansacare.com/images/coin-master-hack-extension_GM406889139.pdfIn PDF document text
    • http://ansacare.com/images/coin-master-free-spins-links-2021_GM406889139.pdfIn PDF document text
    • http://ansacare.com/images/minecraft-pc-free_GM479516143.pdfIn PDF document text
    • http://ansacare.com/images/roblox-hack-com_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_004_off00005125.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5125 24876 bytes
SHA-256: ba0277c027db5de74aaccbb248d7b99b301c7bfd783911d476ea681aed956187
font_01_sfnt_off0000895d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x895D 18948 bytes
SHA-256: 5f027738f6c98c8e4de8a6842f269f559510c1652fa403e8b78e91831fbcf4ef

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