Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1d38758bb246891…

MALICIOUS

PDF

46.0 KB Created: 2021-05-17 05:34:00 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 0eb3f9d56fbf5e11127b16d1f5f4a904 SHA-1: eab21537e447782bbb81251e9252f854136515bb SHA-256: f1d38758bb246891ec302471e71186eb835c26d182f4b475b1cd08852ddc7d8f
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 0.9432

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/406889139/free-coin-master-spins-without-human-verification-game-hack PDF link annotation
    • https://morishita-tc.com.tw/image/data/files/how-to-get-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/free-robux-thumbnail_GM431946152.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/is-roblox-free-on-nintendo-switch_GM431946152.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/free-minecraft-maps-pe_GM479516143.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/coin-master-free-link-spin_GM406889139.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/how-to-get-free-robux-without-verifying_GM431946152.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/can-you-get-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/how-to-download-minecraft-hacks_GM479516143.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/how-to-hack-coin-master-ios_GM406889139.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/fast-robux-online_GM431946152.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/how-do-you-earn-free-coins-for-coin-master_GM406889139.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/2021-roblox_GM431946152.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/roblox-free-robux-website_GM431946152.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/free-robux-with-no-verification_GM431946152.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/minecraft-free-exe_GM479516143.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/coin-master-free-spins-link-2021-ios_GM406889139.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/coin-master-free-2021-spin-link_GM406889139.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/hack-a-game_GM431946152.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/how-you-get-free-robux_GM431946152.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/robux-today_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off000049b3.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x49B3 25616 bytes
SHA-256: af4e0fa6b69045369741ea8677bd3d461f1a1cc4eb91369928a9e2be5f5503e5
font_01_sfnt_off00008379.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8379 3560 bytes
SHA-256: c953d730e49f69c7d62e02a926729ae4a31de13d9a976dc4a95b39cf47066c93
font_02_sfnt_off00008fff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8FFF 18784 bytes
SHA-256: 2ea73084728f1b585ff149514882d7306693ae2bd3bbffba62615d44dd485d67

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