Malicious PDF — malware analysis report

Static analysis result for SHA-256 2444ea76a1c5408e…

MALICIOUS

PDF

46.9 KB Created: 2021-05-17 10:09:40 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 1f2d22ee4482e8d18eec1fd2968a40e2 SHA-1: 697ccd23460c36e2a946f91aa5832d88aa0b178b SHA-256: 2444ea76a1c5408e980acbbd6af879dcee62858b90a2fb7f009297ae578b337f
130 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded links that are identified as malicious redirectors, specifically leading to a 'free generator / game hack' lure. The document body text reinforces this by displaying phrases like 'Get Free Robux' and 'CLICK HERE TO ACCESS ROBLOX GENERATOR', directly encouraging the user to click the malicious link. The primary IOC is the redirector URL used in the lure.

Machine Learning

  • Nyx PDF Classifier clean score 0.0147

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/431946152/get-free-robux-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_off00003555.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3555 25144 bytes
SHA-256: ed188ef1dddfb643a56c13e89c22eea474a0c1efeb6daa872681685c068b4590
font_01_sfnt_off00006f0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6F0D 12848 bytes
SHA-256: 71233759897c21d23b8be055c75570472ce5a80ae7d55e10d3172984ee1b5aa3
font_02_sfnt_off00009717.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9717 18120 bytes
SHA-256: 79ac164380d838bf2943c127f808202d45f8751c05dbd036140e6fb9b1b49848

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