Malicious PDF — malware analysis report

Static analysis result for SHA-256 c91098641968ec31…

MALICIOUS

PDF

39.3 KB Created: 2021-05-14 09:01:45 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-27
MD5: dc8cb34573a5820c55a27c091fef168f SHA-1: 4502bfec0ccfed6bd15bdfd9dad30dfa8b25401d SHA-256: c91098641968ec31480750bb6c5f0c220b9dbcad3499dd3ee70ea6107edb6c56
170 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains a critical heuristic firing for a malicious redirector link, specifically pointing to a "hack spin coin master game hack" lure. It also displays a fake CAPTCHA, designed to trick users into interacting with the malicious content. The embedded URL leads to a known malicious redirector infrastructure, suggesting the primary goal is to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier clean score 0.0128

Heuristics 5

  • 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.
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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/hack-spin-coin-master-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_off0000357e.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x357E 25348 bytes
SHA-256: 93b251395db783bc668e27f85dbdf6a3d99cb4dc7171ba41eeecd3beddfe0a14
font_01_sfnt_off00006f36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6F36 2880 bytes
SHA-256: 10d025f04f706eb71cdda4f99784df1b9ccb52e48080e43095e0398eaef6f132
font_02_sfnt_off00007921.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7921 17892 bytes
SHA-256: 69d13a3c8714eb3dc3a02fadd36b14af4b9de34ef00b9c69ce1967a940d24287

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