Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4dfa198fa89933e…

MALICIOUS

PDF

37.0 KB Created: 2021-05-23 03:43:14 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 09cce0c2c09bcd482e09921c1b5beba1 SHA-1: 4edfabb6cd9a7bad80f7c16439168d6b072725d2 SHA-256: a4dfa198fa89933ea754c401f551da34eab34659b06fcc4f2681f6694ab61c75
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. The file routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7010

Heuristics 4

  • PDF links to a 'free generator / game hack' redirector high 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.
  • 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
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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/835599320/free-tiktok-fans-no-verification-game-hack PDF link annotation
    • http://umksn.pl/images/robux-win_GM431946152.pdfIn PDF document text
    • http://umksn.pl/images/coin-master-free-daily-spins_GM406889139.pdfIn PDF document text
    • http://umksn.pl/images/static-moonactive-net-rewards-2021_GM406889139.pdfIn PDF document text
    • http://umksn.pl/images/hacks-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://umksn.pl/images/plug-toolbox-for-minecraft-free-ios_GM479516143.pdfIn 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_002_off00002fad.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2FAD 23852 bytes
SHA-256: 22140d9f43ea91bc0f78e67a92359528d6f5367f95167495b86fbceed65978f7
font_01_sfnt_off00006615.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6615 2956 bytes
SHA-256: cd398f0a3e5fad3dfd432290f9d263fbb8e9feb14d0d5e607d9e92d06249d502
font_02_sfnt_off00007043.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7043 17816 bytes
SHA-256: db30cff21771a834018d301e3e15668d4f696dd14c251b75c79f93eed26cd5f9

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