Malicious PDF — malware analysis report

Static analysis result for SHA-256 dec8ef74f3e8767b…

MALICIOUS

PDF

42.7 KB Created: 2021-05-16 09:05:43 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: bfe655b44e331f1047326eadce31899e SHA-1: fd6c190f3bcd6443745f3e26d612c60ca73d221d SHA-256: dec8ef74f3e8767b560a15e3bbeb9e24c5ccff3f178b1c10e1927cb21d4e5810
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. The file routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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 https://netcdn.xyz/app/431946152/free-roblox-game-hack PDF link annotation
    • http://en.leechan.com.cn/Public/upload/editorfiles/no-human-verification-hack-for-coin-master_GM406889139.pdfIn PDF document text
    • http://en.leechan.com.cn/Public/upload/editorfiles/free-robux-generator-2021_GM431946152.pdfIn PDF document text
    • http://en.leechan.com.cn/Public/upload/editorfiles/unlimited-spin-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://en.leechan.com.cn/Public/upload/editorfiles/free-roblox-items-codes_GM431946152.pdfIn PDF document text
    • http://en.leechan.com.cn/Public/upload/editorfiles/free-money-and-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://en.leechan.com.cn/Public/upload/editorfiles/get-free-robux_GM431946152.pdfIn PDF document text
    • http://en.leechan.com.cn/Public/upload/editorfiles/coin-master-home_GM406889139.pdfIn PDF document text
    • http://en.leechan.com.cn/Public/upload/editorfiles/promo-code-free-robux_GM431946152.pdfIn PDF document text
    • http://en.leechan.com.cn/Public/upload/editorfiles/how-to-get-free-robux-without-offers_GM431946152.pdfIn PDF document text
    • http://en.leechan.com.cn/Public/upload/editorfiles/free-robux-gen_GM431946152.pdfIn PDF document text
    • http://en.leechan.com.cn/Public/upload/editorfiles/cute-free-roblox-outfits_GM431946152.pdfIn PDF document text
    • http://en.leechan.com.cn/Public/upload/editorfiles/roblox-t-shirt-free_GM431946152.pdfIn PDF document text
    • http://en.leechan.com.cn/Public/upload/editorfiles/fbchampion_GM406889139.pdfIn PDF document text
    • http://en.leechan.com.cn/Public/upload/editorfiles/roblox-c9m_GM431946152.pdfIn PDF document text
    • http://en.leechan.com.cn/Public/upload/editorfiles/get-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • http://en.leechan.com.cn/Public/upload/editorfiles/get-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://en.leechan.com.cn/Public/upload/editorfiles/coin-master-free-spins-link-2021-today_GM406889139.pdfIn PDF document text
    • http://en.leechan.com.cn/Public/upload/editorfiles/how-to-hack-a-minecraft-server-and-make-yourself-op_GM479516143.pdfIn PDF document text
    • http://en.leechan.com.cn/Public/upload/editorfiles/lots-of-robux_GM431946152.pdfIn PDF document text
    • http://en.leechan.com.cn/Public/upload/editorfiles/roblox-robux-hack-generator_GM431946152.pdfIn PDF document text
    • https://Buy.HoaxMC.comIn PDF document text
    • https://discordIn 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_003_off00004a2a.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4A2A 26364 bytes
SHA-256: 0f4dc0976f9bdbd14cb2102c55195467810b3b1f13bfba65108a87f896bfaef8
font_01_sfnt_off00008568.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8568 17948 bytes
SHA-256: abd46f863f925739c6779ba87e0350ce04166d926cbd983fd5dc50e2b294e41e

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