Malicious PDF — malware analysis report

Static analysis result for SHA-256 57711fa4049c1ece…

MALICIOUS

PDF

45.4 KB Created: 2021-06-03 05:10:52 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 7189043407776c977730263828307d45 SHA-1: c98139235ea73f2f3c3d6155bbb4d3943c2666a5 SHA-256: 57711fa4049c1ece1ba7c4e95f5c16aea697f4676a18436c3b5a7b2912d4a171
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 0.9797

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.online/app/406889139/coin-master-card-hack-app-game-hack PDF link annotation
    • http://foo.com.tw/files/free-robux-without-verification_GM431946152.pdfIn PDF document text
    • http://foo.com.tw/files/coin-master-game-hack-version-download_GM406889139.pdfIn PDF document text
    • http://foo.com.tw/files/free-cheat-codes-for-coin-master_GM406889139.pdfIn PDF document text
    • http://foo.com.tw/files/coin-master-daily-free-spins-haktuts_GM406889139.pdfIn PDF document text
    • http://foo.com.tw/files/how-to-hack-roblox-accounts-for-robux_GM431946152.pdfIn PDF document text
    • http://foo.com.tw/files/how-to-get-1-million-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • http://foo.com.tw/files/roblox-hack-game_GM431946152.pdfIn PDF document text
    • http://foo.com.tw/files/is-pokemon-go-a-free-app_GM1094591345.pdfIn PDF document text
    • http://foo.com.tw/files/coin-master-game-free-play-online_GM406889139.pdfIn PDF document text
    • http://foo.com.tw/files/free-robux-2021_GM431946152.pdfIn PDF document text
    • http://foo.com.tw/files/how-to-get-free-robux-hack_GM431946152.pdfIn PDF document text
    • http://foo.com.tw/files/minecraft-java-edition-code-free_GM479516143.pdfIn PDF document text
    • http://foo.com.tw/files/oprewards-free-robux_GM431946152.pdfIn PDF document text
    • http://foo.com.tw/files/coin-master-free-cards-link-2021_GM406889139.pdfIn PDF document text
    • http://foo.com.tw/files/earn-free-robux-today_GM431946152.pdfIn PDF document text
    • http://foo.com.tw/files/how-to-hack-coin-master-ios_GM406889139.pdfIn PDF document text
    • http://foo.com.tw/files/microsoft-free-robux_GM431946152.pdfIn PDF document text
    • http://foo.com.tw/files/minecraft-free-download-ios_GM479516143.pdfIn PDF document text
    • http://foo.com.tw/files/minecraft-free-trial_GM479516143.pdfIn PDF document text
    • http://foo.com.tw/files/coin-master-hack-2021-app_GM406889139.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_004_off00004d6d.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4D6D 25464 bytes
SHA-256: 031a59e48b7ba829ed0d462d3c15921f079e6aac0da2a8b65aba795130b8abdd
font_01_sfnt_off00008551.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8551 2840 bytes
SHA-256: 3fb127b764b9d10f5525bc4de5ec8316de704409ccb0cf21cff3ad8a30d11676
font_02_sfnt_off00008f03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8F03 18068 bytes
SHA-256: 253c022fea36e2edfdded8e932a5d2c5ace7c2c75107348eb73538d72e63084f

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