Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3233b3e299076dd…

MALICIOUS

PDF

35.8 KB Created: 2021-05-20 13:39:45 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 81f2686440a1893d73005605a8226103 SHA-1: 4e9ce4419ee77ed9cf72a07583bcd8675f1ca6ca SHA-256: f3233b3e299076dd76e88768a0e5c9073db1d9730d851b3e65aa8beadc79167d
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains embedded URLs and text that strongly suggest a lure for a Coin Master game hack. The ML classifier also flagged the PDF as malicious. The presence of a call-to-action button further supports the malicious intent, likely to redirect users to a malicious website for a scam or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9508

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-spins-blogspot-game-hack In PDF document text
    • https://digilib.stimlog.ac.id/repository/how-to-get-free-spins-and-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/coin-master--hack_GM406889139.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/free-robux-giveaway-live_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/25-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/how-to-get-free-robux-2021-easy_GM431946152.pdfIn 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_002_off00003204.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3204 24908 bytes
SHA-256: b295c332773355208d30ae7f4962a3136c6492c56301f3d1e73dfda005ba9c4a
font_01_sfnt_off000069fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x69FA 18464 bytes
SHA-256: 7f13c81e41627db5de1fdc011b77043c9877b216986226f08b9acd2eded814ce

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