Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfd9243310d981de…

MALICIOUS

PDF

36.3 KB Created: 2021-05-10 12:37:08 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 640c531dc031c49addca881443b3c475 SHA-1: 36972a7f14e2c33523a5e957ecdc85fc20699b8e SHA-256: dfd9243310d981de8e8fc5bd754a5b98c950ba1635c8752cee53cd87a9191b10
130 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded links that redirect to a website offering a 'game hack', a common lure for phishing or malware distribution. The heuristic firings confirm the presence of malicious redirector links and a download button lure. While no scripts were extracted, the document body and heuristics strongly suggest a phishing attempt to drive users to a malicious site.

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/coin-master-free-foxy-food-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_off000033f8.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x33F8 24516 bytes
SHA-256: bb15800fbe78619852c221ec0cb52148b18cae269a676aff30c15c1e6a3b25ee
font_01_sfnt_off00006ca9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6CA9 18272 bytes
SHA-256: 8ab577f7d11ec357d53ae04dd403853c84d9c5a16931abfa6eafc1dca89914d9

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