Malicious PDF — malware analysis report

Static analysis result for SHA-256 2efdd53cb8d3aa3d…

MALICIOUS

PDF

34.2 KB Created: 2021-07-09 11:54:50 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: c710fb234cf90a538b476231bc223585 SHA-1: e78169d92479217bbb7e2664ce0d0f7206cdb49d SHA-256: 2efdd53cb8d3aa3d8ad130b1705797f4153d03b00f3fe5b3533275a7177448df
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links to external websites, primarily promoting 'free Robux' or game hacks. The heuristic 'PDF_GAME_HACK_REDIRECT_LURE' specifically flags the primary URL as a lure for such content. While no scripts were extracted, the presence of embedded URLs and the nature of the lures suggest an attempt to direct users to potentially malicious sites, likely for credential harvesting or malware distribution. 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 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/431946152/free-robux-co-game-hack PDF link annotation
    • http://atiltd.com.tw/upload/files/minecraft-beta-free_GM479516143.pdfIn PDF document text
    • http://atiltd.com.tw/upload/files/free-spins-and-coins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://atiltd.com.tw/upload/files/fortnite-roblox-play-free_GM431946152.pdfIn PDF document text
    • http://atiltd.com.tw/upload/files/free-robux-sites-that-work_GM431946152.pdfIn PDF document text
    • http://atiltd.com.tw/upload/files/consquence-of-hacking-roblox_GM431946152.pdfIn PDF document text
    • http://atiltd.com.tw/upload/files/coin-master-spin-free_GM406889139.pdfIn PDF document text
    • http://atiltd.com.tw/upload/files/minecraft-java-edition-redeem-code-free-2021_GM479516143.pdfIn PDF document text
    • http://atiltd.com.tw/upload/files/how-to-get-free-robux-without-doing-anything_GM431946152.pdfIn PDF document text
    • http://atiltd.com.tw/upload/files/minecraft-free-download-iphone_GM479516143.pdfIn PDF document text
    • http://atiltd.com.tw/upload/files/how-to-buy-robux-for-free_GM431946152.pdfIn PDF document text
    • http://atiltd.com.tw/upload/files/how-to-get-free-skins-in-minecraft_GM479516143.pdfIn PDF document text
    • http://atiltd.com.tw/upload/files/como-ser-hacker-en-roblox-adopt-me_GM431946152.pdfIn PDF document text
    • http://atiltd.com.tw/upload/files/how-to-get-free-robux-on-phone_GM431946152.pdfIn PDF document text
    • http://atiltd.com.tw/upload/files/robux-free-c_GM431946152.pdfIn PDF document text
    • http://atiltd.com.tw/upload/files/free-roblox-hacks-for-good_GM431946152.pdfIn PDF document text
    • http://atiltd.com.tw/upload/files/free-roblox-exploit-download_GM431946152.pdfIn PDF document text
    • http://atiltd.com.tw/upload/files/how-to-create-a-roblox-game-for-free_GM431946152.pdfIn PDF document text
    • http://atiltd.com.tw/upload/files/coin-master-facebook-page_GM406889139.pdfIn PDF document text
    • http://atiltd.com.tw/upload/files/coin-master-hacks-for-free-spins_GM406889139.pdfIn PDF document text
    • http://atiltd.com.tw/upload/files/free-robux-generator-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
font_00_sfnt_off00003035.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3035 22236 bytes
SHA-256: fd6e596c6a54731a0e7bb677d2060ff6133bad3da86b2ee46b919bd5a65ca05e
font_01_sfnt_off00006189.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6189 18716 bytes
SHA-256: ae86725dd70d168e8b5a24377d7effb3bd88f81667aa3e091abc0f5759eb354b

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