Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3efda1b1adfb290…

MALICIOUS

PDF

39.2 KB Created: 2021-06-03 14:42:08 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 5a6a384e6ed974da5255c938aa7844aa SHA-1: d3c057258b693cbf32b64f7f49c74d9e1cf8ba19 SHA-256: b3efda1b1adfb29007a2e691f26c2dc5505dd3bbbd0e066f5a411b6108ab05ec
130 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple heuristics indicating a malicious redirector link, specifically pointing to a 'free generator' or 'game hack' lure. The embedded URL, https://netcdn.online/app/406889139/free-spin-and-coin-blogspot-game-hack, is identified as a malicious redirector. The document body, though partially corrupted, contains text related to 'Free Spin And Coin Blogspot' and a call to action, reinforcing the lure. No scripts were extracted, but the presence of a malicious redirector suggests an attempt to lead the user to a malicious site, likely for further exploitation or malware delivery.

Machine Learning

  • Nyx PDF Classifier clean score 0.0353

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.online/app/406889139/free-spin-and-coin-blogspot-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_004_off00003ea4.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3EA4 25124 bytes
SHA-256: d9e986811e76381e04a05afb40eb220b233b88f4805047a70d47f4930548c61d
font_01_sfnt_off0000777d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x777D 18412 bytes
SHA-256: cb02a0a7339bbfb7c1b17cd559942ff19a97950a5bd5d5859ed5395f6b052c82

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