Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ff88a2d7b255efc…

MALICIOUS

PDF

33.2 KB Created: 2021-05-21 15:11:41 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: a80701e2d8bf4cb6ad3baa6d851fd2df SHA-1: 5a015462e482516aa86f31492088bf003666255f SHA-256: 4ff88a2d7b255efcfb5ceb90c6ad95a23fcea30e58e447c8de5ec1342201ba57
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a high-severity heuristic firing for a 'GAME_HACK_REDIRECT_LURE' pointing to a suspicious URL. The document body also contains text and links related to 'TikTok Free Like' and 'CLICK HERE TO ACCESS TIKTOK GENERATOR', reinforcing the lure. The embedded URLs suggest the PDF is part of a campaign distributing links to generators or cheats, likely leading to malware downloads or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9506

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/tiktok-free-like-game-hack PDF link annotation
    • http://deyuan-pc.com.tw/images/how-to-earn-robux_GM431946152.pdfIn PDF document text
    • http://deyuan-pc.com.tw/images/free-spins-coin-master-links-2021_GM406889139.pdfIn PDF document text
    • http://deyuan-pc.com.tw/images/how-do-we-get-free-robux_GM431946152.pdfIn PDF document text
    • http://deyuan-pc.com.tw/images/coin-master-twitter_GM406889139.pdfIn PDF document text
    • http://deyuan-pc.com.tw/images/can-you-get-robux-for-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
stream_002_off00002d0b.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2D0B 23672 bytes
SHA-256: 4d37bd5737dd9fadb414fe397ae41171547dcb30136df326ed014024e57eda01
font_01_sfnt_off000062e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x62E4 17456 bytes
SHA-256: ba884a245873681fcb5f05192b04ab87cd2c9026a3a4d64f61f82205aeb44e01

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