Malicious PDF — malware analysis report

Static analysis result for SHA-256 da2e71affb895f21…

MALICIOUS

PDF

35.1 KB Created: 2021-07-09 05:12:40 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 9ae881ae5d974d9c0473cb1d0b2615c0 SHA-1: 11a70effa28cbe77958573e4d779cf3b42642155 SHA-256: da2e71affb895f21b2b2c70b1ae4332ffbdc7901b6accf402e16f0d255511ba4
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 0.9980

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/406889139/25-free-spins-coin-master-game-hack PDF link annotation
    • https://smark.com.tw/image/data/files/minecraft-ps4-code-free_GM479516143.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/coin-and-spin-link_GM406889139.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/minecraft-free-download-android-apk-014-0_GM479516143.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/websites-that-give-free-robux_GM431946152.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/earn-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/free-coin-master-s_GM406889139.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/roblox-cheat-engine_GM431946152.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/how-to-get-robux-fast_GM431946152.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/how-to-get-free-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/coin-master-hack-cheat-engine_GM406889139.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/blogspot-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/counter-blox-roblox-offensive-skins-hack_GM431946152.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/free-robux-survey_GM431946152.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/pokemon-go-free-balls-2021_GM1094591345.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/barren-roblox-hack_GM431946152.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/hpw-to-hack-roblox-android-step-by-step_GM431946152.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/how-to-get-free-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/pubg-uc-zarah_GM1330123889.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/how-to-get-robux_GM431946152.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/coin-master-free-spins-promo-code_GM406889139.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_off00003428.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3428 22400 bytes
SHA-256: 75718b7d0734b0ca74ea9a309213927655768a758031286f106c92aaead638f3
font_01_sfnt_off00006615.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6615 18432 bytes
SHA-256: ec79058dc3660cd38899abd0af6a529c62159de1466b2a8febb865623eb50a1d

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