Malicious PDF — malware analysis report

Static analysis result for SHA-256 1db9cd231ebc6438…

MALICIOUS

PDF

45.1 KB Created: 2021-05-11 22:35:11 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 52ad8bfe8328a3d54d6cd336c45123f3 SHA-1: 52dbbe8eb63e70185a5563b46dd92dacff160b26 SHA-256: 1db9cd231ebc643879b49cc2a13f96bd4c9d8a55586de74a6f5d25674e1ff906
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple embedded URLs, with a primary focus on luring users with 'game hack' and 'free spins' content. The heuristic 'PDF_GAME_HACK_REDIRECT_LURE' and the presence of numerous related URLs strongly indicate a phishing or scam attempt. While no scripts were directly extracted, the PDF structure itself facilitates the redirection to these malicious sites, likely as part of a broader social engineering campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9632

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/coin-master-free-spins-link-blogspot-game-hack PDF link annotation
    • https://smark.com.tw/image/data/files/coin-master-heaven-free-spins-today_GM406889139.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/coin-master-free-spin-whatsapp-group_GM406889139.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/robux-match_GM431946152.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/roblox-free-robux-hack_GM431946152.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/coin-master-free-coins-and-spins-daily_GM406889139.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/rbl-gg-free-robux_GM431946152.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/free-robux-codes-2021-real_GM431946152.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/free-account-roblox-2021_GM431946152.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/coin-master-hack-extension_GM406889139.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/robux-free-gift-card-org-hack_GM431946152.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/free-robux-ad_GM431946152.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/free-robux-on-ipad_GM431946152.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/coin-master-hack-version-download-2021-android_GM406889139.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/free-robux-generator-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/how-to-get-free-robux-hack-2021_GM431946152.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/coin-master-free-spins-link-today-facebook_GM406889139.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/cheats-coin-master-free-spins-and-news_GM406889139.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/coin-master-game-hack-link_GM406889139.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/roblox-army-free-robux_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_off00004a29.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4A29 24952 bytes
SHA-256: 3d7a6da30c55a8e2378ea7ba05ced4e2738d07e236c37cd79835890818a9bf03
font_01_sfnt_off00008297.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8297 2880 bytes
SHA-256: 10d025f04f706eb71cdda4f99784df1b9ccb52e48080e43095e0398eaef6f132
font_02_sfnt_off00008c82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8C82 18632 bytes
SHA-256: bdbf3986ec68ee3b496ae89412d1d0f392e3b826f1ca321ec58289079c9e4546

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