Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a8ce6cabbefc802…

MALICIOUS

PDF

32.8 KB Created: 2021-07-04 04:34:03 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-21
MD5: b338f5f43bcf28dd77a44bd2176d81f4 SHA-1: 01599ff9bc62abdbb9a7e18f6bff9b27051e6c17 SHA-256: 5a8ce6cabbefc802248086482907308636f9f321e38e40a107faae0fab062b19
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a critical heuristic firing for a game hack redirect lure, pointing to a known malicious URL. The document body, though partially corrupted, also contains the same URL, reinforcing the lure. The ML classifier also flagged this PDF with high confidence. The primary attack vector is likely spearphishing attachment, leading the user to click a malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 4

  • PDF links to a 'free generator / game hack' redirector critical 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. CRITICAL on its own: the /app/<id>/<slug>-game-hack path shape is unambiguous scam infra, and the host rotates so a host-list match can't be relied on.
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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
  • 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/835599320/tiktok-for-free-game-hack In PDF document text
    • https://www.legclub.org/uploads/files/files/roblox-cheat-engine-scripts-2021_GM431946152.pdfIn PDF document text
    • https://www.legclub.org/uploads/files/files/how-you-get-robux_GM431946152.pdfIn PDF document text
    • https://www.legclub.org/uploads/files/files/coin-master-hack-android-no-root_GM406889139.pdfIn PDF document text
    • https://www.legclub.org/uploads/files/files/free-spins-in-coin-master-without-human-verification_GM406889139.pdfIn PDF document text
    • https://www.legclub.org/uploads/files/files/cara-cheat-roblox-lumber-tycoon-2_GM431946152.pdfIn PDF document text
    • https://www.legclub.org/uploads/files/files/how-to-sue-roblox_GM431946152.pdfIn PDF document text
    • https://www.legclub.org/uploads/files/files/coin-master-free-cards_GM406889139.pdfIn PDF document text
    • https://www.legclub.org/uploads/files/files/roblox-robux-hack-generator-survey-and-no-download_GM431946152.pdfIn PDF document text
    • https://www.legclub.org/uploads/files/files/buy-robux-free_GM431946152.pdfIn PDF document text
    • https://www.legclub.org/uploads/files/files/hacker-t-dog-roblox_GM431946152.pdfIn PDF document text
    • https://www.legclub.org/uploads/files/files/master-coin-hack-game_GM406889139.pdfIn PDF document text
    • https://www.legclub.org/uploads/files/files/how-to-get-uc-and-bp-in-pubg_GM1330123889.pdfIn PDF document text
    • https://www.legclub.org/uploads/files/files/fog-removed-hack-roblox_GM431946152.pdfIn PDF document text
    • https://www.legclub.org/uploads/files/files/how-to-get-more-robux-for-free_GM431946152.pdfIn PDF document text
    • https://www.legclub.org/uploads/files/files/get-free-robux-com_GM431946152.pdfIn PDF document text
    • https://www.legclub.org/uploads/files/files/robux-sites_GM431946152.pdfIn PDF document text
    • https://www.legclub.org/uploads/files/files/hack-coin-master-android_GM406889139.pdfIn PDF document text
    • https://www.legclub.org/uploads/files/files/roblox-free-mvp_GM431946152.pdfIn PDF document text
    • https://www.legclub.org/uploads/files/files/free-robux-no-offers-2021_GM431946152.pdfIn PDF document text
    • https://www.legclub.org/uploads/files/files/coin-master-daily-free-spins-link_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_off00002dc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2DC4 21920 bytes
SHA-256: d72dd3a8eb039ef51647e0c5abe59f837c8f2232bad85f44dee5757078df1654
font_01_sfnt_off00005e66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5E66 17972 bytes
SHA-256: c2ea0ec047dda9dae57c7b6fccb39bb9de8bc1653c054defbe0bc43e3e19fae1

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