Malicious PDF — malware analysis report

Static analysis result for SHA-256 380b9f19c2f2aa28…

MALICIOUS

PDF

38.7 KB Created: 2021-05-20 20:26:52 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 8eb35ef61bd0765c71cc5003385bd7b5 SHA-1: 78b918a4501f4c7f2ea1dca32cd8486f78d86475 SHA-256: 380b9f19c2f2aa289132412fbd568dee122134dc46476ddcc5a05d40ce6536e2
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains heuristics indicating it links to a "free generator / game hack" redirector, specifically mentioning "free Robux". The embedded URL and multiple related URLs found in the document body all point to websites offering game cheats or currency. This suggests a social engineering lure to drive traffic to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8060

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/431946152/lazy-blocks-com-free-robux-game-hack PDF link annotation
    • https://www.astrospace.com.tw/upload/files/how-to-get-free-robux-without-doing-anything_GM431946152.pdfIn PDF document text
    • https://www.astrospace.com.tw/upload/files/coin-master-hack-apk-download_GM406889139.pdfIn PDF document text
    • https://www.astrospace.com.tw/upload/files/can-you-give-me-robux_GM431946152.pdfIn PDF document text
    • https://www.astrospace.com.tw/upload/files/coin-master-event-hack_GM406889139.pdfIn PDF document text
    • https://www.astrospace.com.tw/upload/files/coin-master-100-free-spins-link_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_off00002f95.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2F95 25164 bytes
SHA-256: 238e2d878a2419b55ce8d99861566207518b866f2567417142522957b3292117
font_01_sfnt_off00006999.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6999 2880 bytes
SHA-256: 10d025f04f706eb71cdda4f99784df1b9ccb52e48080e43095e0398eaef6f132
font_02_sfnt_off00007384.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7384 19008 bytes
SHA-256: 34c8d34d38b90765c6e33941713304debcf78082891e10a16d595afa5c3321d4

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