Malicious PDF — malware analysis report

Static analysis result for SHA-256 d244c7f9c8491244…

MALICIOUS

PDF

35.6 KB Created: 2021-07-04 05:50:45 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 385075bed705f31aacf97f347d7c46aa SHA-1: 1933ad52b9a3641521003dd462ca453a34376f73 SHA-256: d244c7f9c8491244eff240b99a246e2c2a63b94d47806b9748106505869e523c
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to known malicious redirector infrastructure, specifically advertising 'Coin Master Free Spins' and 'Robux hacks'. These links likely lead to further malicious content or phishing pages designed to trick users into downloading malware or revealing sensitive information. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://netcdn.tw/app/406889139/coin-master-free-spins-link-today-instagram-game-hack In PDF document text
    • https://www.tw-storage.com.tw/upload/files/counter-blox-roblox-rc7-hack_GM431946152.pdfIn PDF document text
    • https://www.tw-storage.com.tw/upload/files/how-to-get-free-robux-without-verification_GM431946152.pdfIn PDF document text
    • https://www.tw-storage.com.tw/upload/files/real-robux-generator-2021_GM431946152.pdfIn PDF document text
    • https://www.tw-storage.com.tw/upload/files/free-swoosh-hair-in-roblox_GM431946152.pdfIn PDF document text
    • https://www.tw-storage.com.tw/upload/files/free-spin-today-coin-master_GM406889139.pdfIn PDF document text
    • https://www.tw-storage.com.tw/upload/files/free-roblox-accounts-with-robux-that-work-2021_GM431946152.pdfIn PDF document text
    • https://www.tw-storage.com.tw/upload/files/free-robux-site-youtube_GM431946152.pdfIn PDF document text
    • https://www.tw-storage.com.tw/upload/files/roblox-epic-minigames-hack-2021_GM431946152.pdfIn PDF document text
    • https://www.tw-storage.com.tw/upload/files/roblox-bloxburg-hack_GM431946152.pdfIn PDF document text
    • https://www.tw-storage.com.tw/upload/files/free-fallin-roblox-id_GM431946152.pdfIn PDF document text
    • https://www.tw-storage.com.tw/upload/files/roblox-how-to-get-free-robux-easy-and-fast_GM431946152.pdfIn PDF document text
    • https://www.tw-storage.com.tw/upload/files/roblox-hack-site_GM431946152.pdfIn PDF document text
    • https://www.tw-storage.com.tw/upload/files/free-free-robux_GM431946152.pdfIn PDF document text
    • https://www.tw-storage.com.tw/upload/files/coin-master-card-collection-hack-2021_GM406889139.pdfIn PDF document text
    • https://www.tw-storage.com.tw/upload/files/free-robux-no-tests_GM431946152.pdfIn PDF document text
    • https://www.tw-storage.com.tw/upload/files/best-free-admin-games-in-roblox_GM431946152.pdfIn PDF document text
    • https://www.tw-storage.com.tw/upload/files/how-to-hack-to-get-robux-2021_GM431946152.pdfIn PDF document text
    • https://www.tw-storage.com.tw/upload/files/free-coins-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://www.tw-storage.com.tw/upload/files/coin-master-free-spins-and-coins-blogspot_GM406889139.pdfIn PDF document text
    • https://www.tw-storage.com.tw/upload/files/roblox-parkour-hack-2021_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_off0000315f.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x315F 23464 bytes
SHA-256: 60d01b6c0ad448dade708b048acae4038f28b20c79d3c9554f23e118d1c2e317
font_01_sfnt_off00006675.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6675 18960 bytes
SHA-256: 2b57405de0e85949a44aff108cdf7d94a29b82b397c72f5efb5695bba03a492e

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