Malicious PDF — malware analysis report

Static analysis result for SHA-256 911089bcc60b581e…

MALICIOUS

PDF

35.5 KB Created: 2021-07-04 20:28:05 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 8edf9d76d66b0966592fda8118e024ec SHA-1: 4b9f595db8adc627cc724cd322713279fa125736 SHA-256: 911089bcc60b581efabdd69c20fced5dd025504c5df82cb4083aac6b48524c15
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded links that redirect to known malicious infrastructure, specifically promoting 'free Robux' generators. The document body and heuristics confirm this lure, aiming to trick users into visiting a potentially harmful site. While no scripts were directly extracted, the PDF structure and embedded URLs strongly suggest a phishing or scam attempt.

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/431946152/how-to-get-free-robux-2021-game-hack In PDF document text
    • https://humansci.kyst.com.tw/image/data/files/free-clothes-for-roblox-avatar_GM431946152.pdfIn PDF document text
    • https://humansci.kyst.com.tw/image/data/files/get-free-robux-no-human-verification_GM431946152.pdfIn PDF document text
    • https://humansci.kyst.com.tw/image/data/files/worst-roblox-avatars_GM431946152.pdfIn PDF document text
    • https://humansci.kyst.com.tw/image/data/files/free-robux-with-inspect-element-2021_GM431946152.pdfIn PDF document text
    • https://humansci.kyst.com.tw/image/data/files/how-to-cheat-on-roblox-code_GM431946152.pdfIn PDF document text
    • https://humansci.kyst.com.tw/image/data/files/cheat-codes-for-theme-park-tycoon-on-roblox_GM431946152.pdfIn PDF document text
    • https://humansci.kyst.com.tw/image/data/files/archery-master-3d-hack-unlimited-coins-cheats_GM406889139.pdfIn PDF document text
    • https://humansci.kyst.com.tw/image/data/files/generator-robux_GM431946152.pdfIn PDF document text
    • https://humansci.kyst.com.tw/image/data/files/free-spins-and-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://humansci.kyst.com.tw/image/data/files/how-to-get-free-robuxs-the-add_GM431946152.pdfIn PDF document text
    • https://humansci.kyst.com.tw/image/data/files/coin-master-daily-spin-link-app_GM406889139.pdfIn PDF document text
    • https://humansci.kyst.com.tw/image/data/files/minecraft-windows-10-edition-free_GM479516143.pdfIn PDF document text
    • https://humansci.kyst.com.tw/image/data/files/roblox-robux-codes-2021_GM431946152.pdfIn PDF document text
    • https://humansci.kyst.com.tw/image/data/files/most-popular-roblox-hack-client_GM431946152.pdfIn PDF document text
    • https://humansci.kyst.com.tw/image/data/files/coin-master-free-spins-link-2021-today_GM406889139.pdfIn PDF document text
    • https://humansci.kyst.com.tw/image/data/files/coin-master-hack-2021-no-human-verification_GM406889139.pdfIn PDF document text
    • https://humansci.kyst.com.tw/image/data/files/rbxfree-com-free-robux_GM431946152.pdfIn PDF document text
    • https://humansci.kyst.com.tw/image/data/files/coinmaster-rewards_GM406889139.pdfIn PDF document text
    • https://humansci.kyst.com.tw/image/data/files/free-25-spins-coin-master-links_GM406889139.pdfIn PDF document text
    • https://humansci.kyst.com.tw/image/data/files/best-minecraft-hacked-client-2021_GM479516143.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_off0000310d.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x310D 22928 bytes
SHA-256: 3ea6f53f07def7f914b97ab35152486b044dfd31a5beb16717d5a90d1ea9d5b5
font_01_sfnt_off000064b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x64B3 19384 bytes
SHA-256: 140efaa19506918d6e23c6f72929d04436b836b18eb9dc717a4a442c24a9fe38

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