Malicious PDF — malware analysis report

Static analysis result for SHA-256 f21f0fdadec2f60b…

MALICIOUS

PDF

33.7 KB Created: 2021-07-05 09:25:37 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 78735b217d3642cd5e44f1b5e205d9dd SHA-1: 12fc9088166ae52ebc9b05ded35f700407f7b3ec SHA-256: f21f0fdadec2f60bf4747c1bfcffcb427162e684ea2775a313f96c1f17041e92
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/835599320/free-tiktok-likes-and-views-game-hack PDF link annotation
    • https://smark.com.tw/image/data/files/free-coins-coin-master-iphone_GM406889139.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/free-draw-2-roblox_GM431946152.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/free-models-on-roblox-are-giving-viruses_GM431946152.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/how-do-you-get-free-robux-without-doing-anything_GM431946152.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/free-robux-ad-2021_GM431946152.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/claim-gg-free-robux_GM431946152.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/coin-master-free-spins-2021_GM406889139.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/pokemon-go-free-864_GM1094591345.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/how-do-you-get-roblox-money_GM431946152.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/pokemon-go-free-event_GM1094591345.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/pubg-uc-and-bp-hack_GM1330123889.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/hack-de-roblox-jailbreak-2021_GM431946152.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/free-spin-and-coin-blogspot_GM406889139.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/free-robux-group-payouts_GM431946152.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/coin-master-free-link-2021_GM406889139.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/speed-hacks-roblox-2021_GM431946152.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/free-mods-for-minecraft-pe_GM479516143.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/roblox-music-hack_GM431946152.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/free-money-in-jailbreak-roblox_GM431946152.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/roblox-old-guest-shirt-free_GM431946152.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_off00002e1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2E1B 22500 bytes
SHA-256: c54c77b37fef730d837aa205f2424df7ebbdfb27eac2beebb8a48c774a3a064f
font_01_sfnt_off00006056.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6056 18444 bytes
SHA-256: a71fc6e11cbb5f375dadec8f77ea0afbd52e7110f452c0ac518b8a9f6942ddf5

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