Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3b943e38cb9c224…

MALICIOUS

PDF

27.4 KB Created: 2021-07-04 11:31:26 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 6fea9dfc689688f8ac6c2748998cf80c SHA-1: 779e87d2f481bd540e926fa67238d073ec11ccfe SHA-256: a3b943e38cb9c224d8db4bba24f2e789c5efe9c1c5aac4635e559bce1785a0cb
130 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to a known malicious URL, masquerading as a game hack. The document body text and heuristic firings confirm the lure is related to 'Coin Master' and 'free spins'. The presence of embedded URLs and the nature of the lure suggest an attempt to trick the user into visiting a malicious site, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier clean score 0.0330

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 http://netcdn.tw/app/406889139/coin-master-claim-free-spins-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_001_off0000181b.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x181B 22052 bytes
SHA-256: 4f747d4d7a2ca0b2633c1af16f9bb4732a2f7613ba12bc81d512c62211dc3ffc
font_01_sfnt_off00004927.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4927 18508 bytes
SHA-256: 1abd1480299989abb1f48682f677ba61eec9d98677dd9594eb02aefabe69620b

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