Malicious PDF — malware analysis report

Static analysis result for SHA-256 57d331b6ef3e9871…

MALICIOUS

PDF

40.2 KB Created: 2021-05-12 11:39:53 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-23
MD5: bf5e8eb4a7e5d5807f1cabdfbdc6ba9e SHA-1: e1e4b9b2d671fc6f599ed2c668c456386b5d22a8 SHA-256: 57d331b6ef3e98711b9ff6b0dc2af2908a204037983df69d05fd7c30fb9f4ffa
130 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains heuristics indicating it's a lure for a 'game hack' and links to a known malicious redirector. The document body, though partially obfuscated, contains phrases like 'Coin Master Free Cards' and 'CLICK HERE TO ACCESS COIN MASTER GENERATOR', reinforcing the lure. The primary malicious IOC is the embedded URL which likely leads to a phishing page or malware download.

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-free-cards-game-hack In 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_off00003454.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3454 26924 bytes
SHA-256: d61228dc66d1d78c437c7a67526c188495a3c8da2f540999196baaa05bd0e11a
font_01_sfnt_off00007308.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7308 2868 bytes
SHA-256: d2d857e2ddc1082c7667b23f2135a5c0ba26a2ff8b42c86c89c8e0b09aece855
font_02_sfnt_off00007cf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7CF3 17884 bytes
SHA-256: dce98ab1a9f6331dfaabbdd57dacdba92c66b57249d10e9c2a1df39138c2a47b

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