Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c8280be3f92e550…

MALICIOUS

PDF

34.4 KB Created: 2021-07-05 20:39:42 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 860e3331809a3424fae6a42d68420d17 SHA-1: 2f8ec6ea4131becc0f410ffbf5018ac4a0a023db SHA-256: 6c8280be3f92e550d3bfe3239c8f2b9cd0d87eadf510c4bf7a77c5067cb528f0
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains multiple links to known malicious redirectors, disguised as "free generator / game hack" lures for popular online games. The ML classifier strongly flagged this PDF as malicious, and the embedded URLs are indicative of a phishing or malware distribution scheme. No scripts were extracted, but the document's primary function appears to be directing users to malicious infrastructure.

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/431946152/how-to-hack-roblox-accounts-for-robux-game-hack In PDF document text
    • http://library.yamasi.ac.id//repository/how-to-make-a-minecraft-server-for-free-java_GM479516143.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/get-free-robux-not-fake_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/how-to-scam-for-free-robux_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id//repository/1x1x1x1-roblox-id_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id//repository/minecraft-coins-free_GM479516143.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/bowy-roblox-hacker_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/hack-ma-pin-roblox_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/free-roblox-buliders-club_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/free-robux-today-app_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/unpatchable-robux-hack_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id//repository/coin-master-hack-without-verification-for-iphone_GM406889139.pdfIn PDF document text
    • http://library.yamasi.ac.id//repository/coin-master-free-spins-hack-no-human-verification_GM406889139.pdfIn PDF document text
    • http://library.yamasi.ac.id//repository/coin-master-daily-free-spins-link-app_GM406889139.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/how-to-get-free-coins-on-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/roblox-exploit-download_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/how-to-hack-mad-murderer-roblox-2021_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/free-minecraft-windows-10-account_GM479516143.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/robuxy-com-free-robux_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/coin-master-free-coins-generator_GM406889139.pdfIn PDF document text
    • http://library.yamasi.ac.id//repository/kachifpro_GM406889139.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
font_00_sfnt_off00002ef6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2EF6 22384 bytes
SHA-256: dacd485a6c8c733035f62052313cf797ec68b0aed04fc4fe2338e797695681de
font_01_sfnt_off000060b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x60B1 19228 bytes
SHA-256: c30d944de0a6baf9276c4865844fcb990da37fa04730b451441052e57c665125

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