Malicious PDF — malware analysis report

Static analysis result for SHA-256 962786e6882d1696…

MALICIOUS

PDF

38.3 KB Created: 2021-05-23 12:06:22 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: b9c7a749802366ee0121f0f0b3a7a3ea SHA-1: badb6677fdf14237232ec21caebf6021a3061f97 SHA-256: 962786e6882d1696632c9a1f34d852aaaf58abc63cf0aec2bcc7ef9c2cb9abe9
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 0.7010

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/835599320/free-college-textbooks-tiktok-game-hack PDF link annotation
    • https://cosmosocean.com.tw/upload/files/how-to-get-free-robux-2021-no-human-verification_GM431946152.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/free-roblox-clothes-girl_GM431946152.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/free-coin-master-spins_GM406889139.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/how-do-i-get-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/free-spins-and-coins-from-coin-master-game_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_002_off00003117.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3117 24808 bytes
SHA-256: 50aa678c38d775b1424d80a46a01eb7f72e5465355859730dcff88f212233ec4
font_01_sfnt_off00006a79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6A79 2840 bytes
SHA-256: 0ff7203f6678b3ce5cadf82d8d4ab75daf80d11355a5b436446d16072593a6f7
font_02_sfnt_off00007434.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7434 18184 bytes
SHA-256: c51aa8ed87b8ee8755a1ecd789814fb67703fc10c946440f5ae6e88abb0f8eda

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