Malicious PDF — malware analysis report

Static analysis result for SHA-256 010b823ea3f5a605…

MALICIOUS

PDF

42.0 KB Created: 2021-05-15 02:02:31 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-22
MD5: f1bcc971be9df07b9d84757e7d180655 SHA-1: f524ddb916162086702940537e0ac32df5e440f4 SHA-256: 010b823ea3f5a605e5c523d8a45edeeb98237aa4294878075950ae63e25043cc
130 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document employs a common lure related to free game resources, specifically for 'Coin Master', to entice users. It contains multiple embedded links pointing to a known malicious redirector infrastructure, which is designed to funnel victims to potentially harmful websites or initiate malware downloads. The document body, though partially corrupted, reinforces the lure with similar phrasing and URLs.

Machine Learning

  • Nyx PDF Classifier clean score 0.0125

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-free-spins-and-coins-daily-links-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_off0000391c.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x391C 27144 bytes
SHA-256: b0e410edae852b5a00214cb6629321c87bf2e0a6d47fc6909438df3b235e8f27
font_01_sfnt_off00007805.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7805 2840 bytes
SHA-256: 3fb127b764b9d10f5525bc4de5ec8316de704409ccb0cf21cff3ad8a30d11676
font_02_sfnt_off000081b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x81B7 18652 bytes
SHA-256: e3d0f3d2cfc9c6a1690771b503077d618c720b070dec55624c93c27d11531b52

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