Malicious PDF — malware analysis report

Static analysis result for SHA-256 454ea13baab5dfdc…

MALICIOUS

PDF

35.5 KB Created: 2021-07-05 06:51:50 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 2699ff57b9a7e75bb2ff464da5946148 SHA-1: 6421a28e32e7c405ba03855aac2096e0e0bada0f SHA-256: 454ea13baab5dfdc90ccb731bbfeb9fd9bc5f24f448a5e49bedb8df964f6d079
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains numerous links to external websites, many of which are hosted on domains associated with link farms and SEO manipulation. The primary lure appears to be 'free game hacks' for popular titles like Coin Master and Roblox. The document's structure and the high number of outbound links suggest a malicious intent to redirect users to potentially harmful sites, likely for phishing or malware distribution. No scripts were extracted, but the PDF's nature strongly indicates a social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • 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.
  • 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 http://netcdn.tw/app/406889139/coin-master-free-spins-app-for-iphone-game-hack PDF link annotation
    • https://www.astrospace.com.tw/upload/files/coin-master-gold-cards-hack_GM406889139.pdfIn PDF document text
    • https://www.astrospace.com.tw/upload/files/robux-gift-card-free_GM431946152.pdfIn PDF document text
    • https://www.astrospace.com.tw/upload/files/all-of-the-free-roblox-clothes_GM431946152.pdfIn PDF document text
    • https://www.astrospace.com.tw/upload/files/robux-hack-wish_GM431946152.pdfIn PDF document text
    • https://www.astrospace.com.tw/upload/files/coin-master-hack-apk-2021_GM406889139.pdfIn PDF document text
    • https://www.astrospace.com.tw/upload/files/how-to-get-free-robux-without-downloading-apps-2021_GM431946152.pdfIn PDF document text
    • https://www.astrospace.com.tw/upload/files/free-promo-codes-for-coin-master_GM406889139.pdfIn PDF document text
    • https://www.astrospace.com.tw/upload/files/free-robux-kid-friendly-no-human-verification_GM431946152.pdfIn PDF document text
    • https://www.astrospace.com.tw/upload/files/how-to-win-attack-madness-in-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://www.astrospace.com.tw/upload/files/roblox-robux-hack-inspect-element-2021_GM431946152.pdfIn PDF document text
    • https://www.astrospace.com.tw/upload/files/how-to-hack-free-robux-no-downloading_GM431946152.pdfIn PDF document text
    • https://www.astrospace.com.tw/upload/files/coin-master-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • https://www.astrospace.com.tw/upload/files/how-to-get-things-free-on-roblox_GM431946152.pdfIn PDF document text
    • https://www.astrospace.com.tw/upload/files/coin-master-free-spins-2021-apk_GM406889139.pdfIn PDF document text
    • https://www.astrospace.com.tw/upload/files/how-to-get-free-robux-on-alcatela5_GM431946152.pdfIn PDF document text
    • https://www.astrospace.com.tw/upload/files/talk-other-player-roblox-gui-hack_GM431946152.pdfIn PDF document text
    • https://www.astrospace.com.tw/upload/files/roblox-fun-com-free-robux_GM431946152.pdfIn PDF document text
    • https://www.astrospace.com.tw/upload/files/free-spins-on-coin-master-app_GM406889139.pdfIn PDF document text
    • https://www.astrospace.com.tw/upload/files/roblox-amera-hack_GM431946152.pdfIn PDF document text
    • https://www.astrospace.com.tw/upload/files/free-roblox-accounts-discord-server_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_002_off00003381.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3381 23248 bytes
SHA-256: a6521a5b539e559d430c2d62c9a68b24eb9742a0edf54bf53de7947bdbed4e65
font_01_sfnt_off00006804.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6804 18340 bytes
SHA-256: 22ec7c2df2d9c103e59d81394999ffb41531b6d4357b2311b3951123c8e62034

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