Malicious PDF — malware analysis report

Static analysis result for SHA-256 14386a323a8cbca4…

MALICIOUS

PDF

40.5 KB Created: 2021-05-21 04:47:43 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 4dda4125a7fbd1f2b99cb18390768437 SHA-1: 6fb6e7dfd3fff3f56779851563cf226df17edf08 SHA-256: 14386a323a8cbca4383851e06a18a6c3251be01995532c9c07a8d1f8e16422de
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to known malicious redirectors, specifically advertising 'free generators' or 'game hacks' to entice users. The document body and embedded artifacts suggest a lure for free in-game currency or similar cheats. The presence of embedded URLs and the ML classifier's flagging strongly indicate malicious intent, likely to lead the user to download a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7776

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/free-robux-please-game-hack In PDF document text
    • http://maslabaou.com/images/pubg-uc-2021-online_GM1330123889.pdfIn PDF document text
    • http://maslabaou.com/images/how-to-get-free-robux-on-phone_GM431946152.pdfIn PDF document text
    • http://maslabaou.com/images/minecraft-free-ios-no-verification_GM479516143.pdfIn PDF document text
    • http://maslabaou.com/images/free-appsfor-coin-master-daily-rewards_GM406889139.pdfIn PDF document text
    • http://maslabaou.com/images/minecraft-free-download-android-apk_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_off00003367.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3367 25812 bytes
SHA-256: 3c14e38eab32ae1e880210be5cdd71011a16e58b7293955ef2a81aa4b3caa5bb
font_01_sfnt_off00006f5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6F5F 3992 bytes
SHA-256: 43e72e756231cfd354bd65c2ed3b09ad4eff56ad11e7f155ed2920e6bb7860dd
font_02_sfnt_off00007c85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7C85 18472 bytes
SHA-256: a4143b220e35e332e52efa777ecf598d1a164c1d6c5ab1887881bf2674d2e637

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