Malicious PDF — malware analysis report

Static analysis result for SHA-256 9906c905245394bc…

MALICIOUS

PDF

36.5 KB Created: 2021-05-14 01:31:58 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 913ab15ce6b3828978343bd0ef4e5262 SHA-1: 81897cc0c7e1d544625368680dd6643139a31b0c SHA-256: 9906c905245394bc73a91b761be96e54ff0766295cf1e43decbc09bdf6099361
130 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple heuristics indicating it is a malicious redirector lure, specifically advertising a 'free generator / game hack'. The primary URL associated with this lure, https://netcdn.xyz/app/406889139/free-spins-coin-master-hack-2021-game-hack, is flagged as malicious infrastructure. While no scripts were explicitly extracted, the PDF structure itself facilitates the redirection, aligning with techniques used to deliver further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier clean score 0.0292

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-spins-coin-master-hack-2021-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_off00003314.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3314 25520 bytes
SHA-256: 5c9b4d9f5a118da03b54ab74ebdfd5aa2115fa7aa5d49da248052dfc22ce52d0
font_01_sfnt_off00006cde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6CDE 18456 bytes
SHA-256: 8f74d6ddd2abce9f563610cbfcc253ce51c057807514da134dc64dcb58b7111e

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