Malicious PDF — malware analysis report

Static analysis result for SHA-256 84e6e0d55bcb5bd6…

MALICIOUS

PDF

35.7 KB Created: 2021-05-19 01:00:40 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 5ac02e5603dc789d06004a2111f6608a SHA-1: 0e9b31b974ff060115ac76e505358cad1da70c5a SHA-256: 84e6e0d55bcb5bd657a30c1f32595845dcc392e2aecc031a711d49d9a19aa55b
130 Risk Score

Malware Insights

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

The PDF contains multiple links to a known malicious redirector infrastructure, disguised as a 'free generator' for a popular game. The document body explicitly prompts the user to 'CLICK HERE TO ACCESS COIN MASTER GENERATOR', indicating a social engineering lure to trick the user into visiting the malicious URL. This suggests the primary goal is to deliver a secondary payload via the redirector.

Machine Learning

  • Nyx PDF Classifier clean score 0.0265

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/get-free-spins-on-coin-master-game-hack In 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_003_off0000325b.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x325B 25052 bytes
SHA-256: 63fb37948f21ca9d0740f39a4b12a28d5bb6cd9fe0287194d2317114f3555505
font_01_sfnt_off00006b7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6B7B 17884 bytes
SHA-256: 200850e3a78b1b50c9881a74b6d24eace04c65468f288c9b2f31b5952499e453

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