Malicious PDF — malware analysis report

Static analysis result for SHA-256 2431fefca5a32146…

MALICIOUS

PDF

48.6 KB Created: 2021-05-10 12:54:03 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 589026c77d1d4b74095f8160c6e39693 SHA-1: 20ca125c6c435f2228f6498fa5ec270db5575f30 SHA-256: 2431fefca5a321464657cc8d123b185856a974050d62bd15f82c092f535d6a2c
130 Risk Score

Malware Insights

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

The PDF document contains a critical heuristic firing for a game hack redirect lure, pointing to a known malicious URL. The document body and embedded artifacts suggest a lure to a website offering 'free coins' and 'game hacks', likely a phishing or scam attempt. The presence of embedded URLs and the nature of the lure indicate an attempt to trick the user into visiting a malicious site, potentially for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier clean score 0.0145

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/free-coins-coin-master-hack-game-hack In PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00003496.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3496 26500 bytes
SHA-256: b98d43212a0bf55c11c03d1a5fcfd00052bf00be71701f4e22074af5de81f8a0
font_01_sfnt_off0000717c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x717C 3088 bytes
SHA-256: e7854aff7cbc8fbdeb85d2b3d6248d12dc820ede8a581f4eac107fa6446c2222
font_02_sfnt_off00007c47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7C47 7960 bytes
SHA-256: cf7ae5cf6bef3222f5a26bec705b492fed0278aec6b16ec101aeda46e0edd2b2
font_03_sfnt_off00008f6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8F6D 17880 bytes
SHA-256: d4b290fbe96f806a63e53895600235ad07ee700a50234ed47d5e5eeda0b1e0de
font_04_sfnt_off0000b01d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB01D 4272 bytes
SHA-256: fac9a06ceb5574feb8580c075df3ef69dfbd0efa4947186cfe90f11b68eaafb0

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