Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c3e81675cae5425…

MALICIOUS

PDF

42.8 KB Created: 2021-05-19 03:30:10 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 328de3ff173e0b03e545aaf4f39b34c4 SHA-1: e6862c32aa507d7a3097757f2863511d7b6ff4b7 SHA-256: 9c3e81675cae5425e6bcc90af2f857c578f962e513b5735a12aeef7e96398b2b
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to known malicious redirector infrastructure, specifically promoting 'free generator' and 'game hack' lures. The document body and embedded URLs strongly suggest a phishing or scam attempt designed to lead users to potentially harmful websites. No scripts were extracted, but the presence of multiple malicious links and the ML classifier's high confidence indicate a high likelihood of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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/cheats-for-coin-master-game-hack In PDF document text
    • https://www.elearning.ma-alqasimiyah.sch.id/__statics/gudangsoal/files/free-robux-generator-no-verification_GM431946152.pdfIn PDF document text
    • https://www.elearning.ma-alqasimiyah.sch.id/__statics/gudangsoal/files/how-to-hack-into-someones-roblox-account_GM431946152.pdfIn PDF document text
    • https://www.elearning.ma-alqasimiyah.sch.id/__statics/gudangsoal/files/free-spins-coin-master-without-survey_GM406889139.pdfIn PDF document text
    • https://www.elearning.ma-alqasimiyah.sch.id/__statics/gudangsoal/files/get-free-robux-generator_GM431946152.pdfIn PDF document text
    • https://www.elearning.ma-alqasimiyah.sch.id/__statics/gudangsoal/files/hack-coin-master-ios-download_GM406889139.pdfIn PDF document text
    • https://www.elearning.ma-alqasimiyah.sch.id/__statics/gudangsoal/files/coin-master-coin-link_GM406889139.pdfIn PDF document text
    • https://www.elearning.ma-alqasimiyah.sch.id/__statics/gudangsoal/files/get-free-robux-info_GM431946152.pdfIn PDF document text
    • https://www.elearning.ma-alqasimiyah.sch.id/__statics/gudangsoal/files/free-coin-master-cards_GM406889139.pdfIn PDF document text
    • https://www.elearning.ma-alqasimiyah.sch.id/__statics/gudangsoal/files/coin-master-free-spins-2021_GM406889139.pdfIn PDF document text
    • https://www.elearning.ma-alqasimiyah.sch.id/__statics/gudangsoal/files/how-to-get-more-robux-for-free_GM431946152.pdfIn PDF document text
    • https://www.elearning.ma-alqasimiyah.sch.id/__statics/gudangsoal/files/coin-master-hack-apk-facebook-login_GM406889139.pdfIn PDF document text
    • https://www.elearning.ma-alqasimiyah.sch.id/__statics/gudangsoal/files/roblox-generator-no-human-verification_GM431946152.pdfIn PDF document text
    • https://www.elearning.ma-alqasimiyah.sch.id/__statics/gudangsoal/files/free-robux-gift-card-codes-2021_GM431946152.pdfIn PDF document text
    • https://www.elearning.ma-alqasimiyah.sch.id/__statics/gudangsoal/files/free-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://www.elearning.ma-alqasimiyah.sch.id/__statics/gudangsoal/files/coin-master-email-free-spins_GM406889139.pdfIn PDF document text
    • https://www.elearning.ma-alqasimiyah.sch.id/__statics/gudangsoal/files/roblox-free-body_GM431946152.pdfIn PDF document text
    • https://www.elearning.ma-alqasimiyah.sch.id/__statics/gudangsoal/files/coin-master-free-spins-link_GM406889139.pdfIn PDF document text
    • https://www.elearning.ma-alqasimiyah.sch.id/__statics/gudangsoal/files/free-robux-websites-that-actually-work-2021_GM431946152.pdfIn PDF document text
    • https://www.elearning.ma-alqasimiyah.sch.id/__statics/gudangsoal/files/mobihack-net-roblox-hack_GM431946152.pdfIn PDF document text
    • https://www.elearning.ma-alqasimiyah.sch.id/__statics/gudangsoal/files/free-pe_GM479516143.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_003_off00004d11.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4D11 25176 bytes
SHA-256: 89677d3be2e4f2ad6af4f727e9069b55ea01d3615e8da24f629b4d36b1504b7a
font_01_sfnt_off00008678.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8678 17876 bytes
SHA-256: 503fe8d746beae52c5eef18798c5d93272f0ad11156ff4c57f17f4a0b53681c9

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