Malicious PDF — malware analysis report

Static analysis result for SHA-256 9fc1f1708f4934e1…

MALICIOUS

PDF

35.9 KB Created: 2021-07-05 13:50:30 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: dd65dc760f8f400556b7d5611d443973 SHA-1: 84471487891a46621c39f5efee1fd79740e4c547 SHA-256: 9fc1f1708f4934e18669bdb8fcfb6dc0d8b0ecb29bed94f7fce5872b336dd26a
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links that redirect to a website offering 'free generator / game hack' content, identified as malicious redirector infrastructure. The ML classifier strongly flagged this PDF as malicious. The embedded URLs and the heuristic firings indicate a social engineering lure to drive traffic to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://netcdn.tw/app/406889139/daily-coin-master-free-spin-link-game-hack In PDF document text
    • http://library.forda-mof.org/katalog/repository/free-promo-codes-roblox_GM431946152.pdfIn PDF document text
    • http://library.forda-mof.org/katalog/repository/minecraft-free-minecoins_GM479516143.pdfIn PDF document text
    • http://library.forda-mof.org/katalog/repository/free-coins-coin-master_GM406889139.pdfIn PDF document text
    • http://library.forda-mof.org/katalog/repository/earn-robux-today-earn-robux-today_GM431946152.pdfIn PDF document text
    • http://library.forda-mof.org/katalog/repository/minecraft-gun-mod-download-free_GM479516143.pdfIn PDF document text
    • http://library.forda-mof.org/katalog/repository/500-free-coin-master-spins_GM406889139.pdfIn PDF document text
    • http://library.forda-mof.org/katalog/repository/free-spins-coin-master-unlimited_GM406889139.pdfIn PDF document text
    • http://library.forda-mof.org/katalog/repository/robux-generator-no-human-verification_GM431946152.pdfIn PDF document text
    • http://library.forda-mof.org/katalog/repository/roblox-promo-code-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://library.forda-mof.org/katalog/repository/how-to-earn-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • http://library.forda-mof.org/katalog/repository/coin-master-hack-dot-xyz_GM406889139.pdfIn PDF document text
    • http://library.forda-mof.org/katalog/repository/collect-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://library.forda-mof.org/katalog/repository/free-robux-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://library.forda-mof.org/katalog/repository/pubg-uc-code-redeem_GM1330123889.pdfIn PDF document text
    • http://library.forda-mof.org/katalog/repository/spin-link_GM406889139.pdfIn PDF document text
    • http://library.forda-mof.org/katalog/repository/free-minecraft-skins-java_GM479516143.pdfIn PDF document text
    • http://library.forda-mof.org/katalog/repository/roblox-hack-generator_GM431946152.pdfIn PDF document text
    • http://library.forda-mof.org/katalog/repository/tiktok-free-mockup_GM835599320.pdfIn PDF document text
    • http://library.forda-mof.org/katalog/repository/roblox-prison-life-hack_GM431946152.pdfIn PDF document text
    • http://library.forda-mof.org/katalog/repository/how-to-get-minecraft-for-free-on-xbox-360_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_002_off0000318e.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x318E 23992 bytes
SHA-256: b289bd40679a004f1e12ac1eb1bbdf06f932978ce1dace4ac1a1825df796c1c4
font_01_sfnt_off00006868.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6868 18768 bytes
SHA-256: 6995f58a3344afdf1c39eea442142c3f86a5b05fd2aa483286546d573d63d37d

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