Malicious PDF — malware analysis report

Static analysis result for SHA-256 3def451b5b3056e9…

MALICIOUS

PDF

44.0 KB Created: 2021-05-14 01:00:54 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-21
MD5: ded93f541f11408792a068778567a1a6 SHA-1: d156753e223919101825f6897cdf0d0dc9679fca SHA-256: 3def451b5b3056e90f4f5c458b0899e26e7731a52cf21c207011fce23d2e83e2
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains embedded links that redirect to malicious infrastructure, specifically promoting "game hacks" and "free generators" for popular games. The primary malicious URL identified is https://netcdn.xyz/app/406889139/coin-master-free-link-game-hack. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest a social engineering tactic to drive traffic to potentially harmful sites, likely as part of a phishing or scam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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-link-game-hack In PDF document text
    • https://elearning.man1tapin.sch.id/__statics/gudangsoal/files/free-robux-promo-codes_GM431946152.pdfIn PDF document text
    • https://elearning.man1tapin.sch.id/__statics/gudangsoal/files/coin-master-game-for-pc-free-download_GM406889139.pdfIn PDF document text
    • https://elearning.man1tapin.sch.id/__statics/gudangsoal/files/coin-master-apk-mod_GM406889139.pdfIn PDF document text
    • https://elearning.man1tapin.sch.id/__statics/gudangsoal/files/roblox-promo-codes-2021-robux_GM431946152.pdfIn PDF document text
    • https://elearning.man1tapin.sch.id/__statics/gudangsoal/files/free-spins-and-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://elearning.man1tapin.sch.id/__statics/gudangsoal/files/how-can-i-get-free-robux_GM431946152.pdfIn PDF document text
    • https://elearning.man1tapin.sch.id/__statics/gudangsoal/files/robux-for-kids_GM431946152.pdfIn PDF document text
    • https://elearning.man1tapin.sch.id/__statics/gudangsoal/files/free-robux-hack-no-human-verification_GM431946152.pdfIn PDF document text
    • https://elearning.man1tapin.sch.id/__statics/gudangsoal/files/coin-master-hack-2021-apk-download_GM406889139.pdfIn PDF document text
    • https://elearning.man1tapin.sch.id/__statics/gudangsoal/files/coin-master-reward-link_GM406889139.pdfIn PDF document text
    • https://elearning.man1tapin.sch.id/__statics/gudangsoal/files/coin-master-free-spins-2021_GM406889139.pdfIn PDF document text
    • https://elearning.man1tapin.sch.id/__statics/gudangsoal/files/roblox-cheat-codes_GM431946152.pdfIn PDF document text
    • https://elearning.man1tapin.sch.id/__statics/gudangsoal/files/prison-life-roblox-hacks_GM431946152.pdfIn PDF document text
    • https://elearning.man1tapin.sch.id/__statics/gudangsoal/files/how-to-make-free-robux_GM431946152.pdfIn PDF document text
    • https://elearning.man1tapin.sch.id/__statics/gudangsoal/files/roblox-hack-com_GM431946152.pdfIn PDF document text
    • https://elearning.man1tapin.sch.id/__statics/gudangsoal/files/how-to-get-minecraft-for-free-on-mobile_GM479516143.pdfIn PDF document text
    • https://elearning.man1tapin.sch.id/__statics/gudangsoal/files/coin-master-download-hack-ios_GM406889139.pdfIn PDF document text
    • https://elearning.man1tapin.sch.id/__statics/gudangsoal/files/robux-boost_GM431946152.pdfIn PDF document text
    • https://elearning.man1tapin.sch.id/__statics/gudangsoal/files/blogger-free-spins-and-coins_GM406889139.pdfIn PDF document text
    • https://elearning.man1tapin.sch.id/__statics/gudangsoal/files/make-free-robux_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_003_off00004c0e.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4C0E 27028 bytes
SHA-256: a9a76d0e5dcc187a529a5c4f774dff6335cb120b8621ac7aa75bb56e1d68ccd6
font_01_sfnt_off00008b24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8B24 17880 bytes
SHA-256: 5ce88b684446e36e89a0643934549b22fce1d776877bbe9d9a558feafde7429d

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