Malicious PDF — malware analysis report

Static analysis result for SHA-256 880070de82cf11ec…

MALICIOUS

PDF

39.1 KB Created: 2021-05-10 12:42:42 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-24
MD5: e49d548ece02261b9c39b48362929f7f SHA-1: 0a04c465c23c88d099836b3a75b606ff5c682f3d SHA-256: 880070de82cf11ecea15a6defe068f314bda240a7475f7b54823ff89e9da5b72
130 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple heuristics indicating it is a lure for a game hack, linking to known malicious redirector infrastructure. The embedded URL `https://netcdn.xyz/app/406889139/coin-master-event-hack-game-hack` is the primary indicator of malicious intent, likely leading to a second-stage download. While no scripts were explicitly extracted, the PDF structure and heuristics suggest an attempt to trick the user into visiting a malicious site.

Machine Learning

  • Nyx PDF Classifier clean score 0.0128

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 https://netcdn.xyz/app/406889139/coin-master-event-hack-game-hack In PDF document text
    • https://coinmasterspinandcoin.comIn 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_003_off00003597.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3597 25176 bytes
SHA-256: e9cd2f11ab272d69c9a563aca9160ffc11738f41f08fd28a5dffdc37247ea16b
font_01_sfnt_off00006ed1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6ED1 2840 bytes
SHA-256: 3fb127b764b9d10f5525bc4de5ec8316de704409ccb0cf21cff3ad8a30d11676
font_02_sfnt_off00007883.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7883 17828 bytes
SHA-256: 3aa3979f7db9db60f85c12743f17b039c262b8ea7d603c2f9581d8dcabd3843c

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