Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1b6f81d3565e41e…

MALICIOUS

PDF

35.0 KB Created: 2021-07-04 10:30:36 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-18
MD5: d79eb86905aa9384fa3e142d2c1952a5 SHA-1: aa31d023c32ac35f1e7d6b904c82c45a092d2800 SHA-256: a1b6f81d3565e41eefe1d7f99440c42b9b7c8e7877de4ccb68f2bb361b223d3d
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple embedded URLs and a prominent link within the document body, all promoting game hacks and generators for popular games like Coin Master and Roblox. The heuristic 'PDF_GAME_HACK_REDIRECT_LURE' strongly indicates a social engineering tactic to trick users into visiting malicious sites. While no scripts were explicitly extracted, the nature of the lures and the embedded URLs suggest a phishing or malware distribution attempt, likely initiated via a spearphishing attachment.

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/406889139/coin-master-card-collection-hack-apk-game-hack PDF link annotation
    • https://nature-air.com.tw/upload/files/free-robux-generator-no-human-verification-or-survey-2021_GM431946152.pdfIn PDF document text
    • https://nature-air.com.tw/upload/files/coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • https://nature-air.com.tw/upload/files/roblox-phantom-forces-aimbot-hack_GM431946152.pdfIn PDF document text
    • https://nature-air.com.tw/upload/files/free-robux-co_GM431946152.pdfIn PDF document text
    • https://nature-air.com.tw/upload/files/roblox-game-for-free-download_GM431946152.pdfIn PDF document text
    • https://nature-air.com.tw/upload/files/coin-mster-free_GM406889139.pdfIn PDF document text
    • https://nature-air.com.tw/upload/files/electrification-free-robux_GM431946152.pdfIn PDF document text
    • https://nature-air.com.tw/upload/files/roblox-meep-city-hacks_GM431946152.pdfIn PDF document text
    • https://nature-air.com.tw/upload/files/http-roblox-com-free-robux_GM431946152.pdfIn PDF document text
    • https://nature-air.com.tw/upload/files/get-free-robux-com_GM431946152.pdfIn PDF document text
    • https://nature-air.com.tw/upload/files/mobihack-roblox-hack_GM431946152.pdfIn PDF document text
    • https://nature-air.com.tw/upload/files/how-to-get-free-robux-20217_GM431946152.pdfIn PDF document text
    • https://nature-air.com.tw/upload/files/how-do-you-get-free-roblox_GM431946152.pdfIn PDF document text
    • https://nature-air.com.tw/upload/files/coin-master-hack-dot-xyz_GM406889139.pdfIn PDF document text
    • https://nature-air.com.tw/upload/files/roblox-hacks-2021_GM431946152.pdfIn PDF document text
    • https://nature-air.com.tw/upload/files/get-free-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://nature-air.com.tw/upload/files/free-robux-without-human-verification-real_GM431946152.pdfIn PDF document text
    • https://nature-air.com.tw/upload/files/how-to-get-a-free-skin-noob-roblox_GM431946152.pdfIn PDF document text
    • https://nature-air.com.tw/upload/files/speed-simulator-roblox-hack_GM431946152.pdfIn PDF document text
    • https://nature-air.com.tw/upload/files/free-minecraft-client_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_off000031ca.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x31CA 22988 bytes
SHA-256: c9f203aa311b2217e93fcfe560ea3fde523232ff44368fbe01b39c87151732f1
font_01_sfnt_off00006591.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6591 18428 bytes
SHA-256: fbaa9a7aa99ed65dc179949451f9d180593252eeb381fe8625a198a51d214ab5

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