Malicious PDF — malware analysis report

Static analysis result for SHA-256 b113656b7a1f2bd6…

MALICIOUS

PDF

35.5 KB Created: 2021-07-04 03:52:29 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-07
MD5: a18eb9bc469dd7424e43d44dee0d372c SHA-1: 23eb5f64ddf596b76382254e5d41d6efd5e57ce7 SHA-256: b113656b7a1f2bd628dec0a09141ec52db26a798c7b16e85fe7ac6cf218c1518
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains numerous links designed to lure users into clicking on what appear to be game hacks and cheats for popular games like Coin Master and Roblox. The primary link redirects to malicious infrastructure, and the document body itself is filled with SEO-optimized links pointing to other PDFs hosted on a suspicious domain. The ML classifier strongly indicated maliciousness, and the overall pattern suggests a phishing or scam attempt to drive traffic to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • 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.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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/coin-master-hack-mod-apk-game-hack In PDF document text
    • https://aits.co.id/ckfinder/userfiles/files/roblox-booga-booga-cheat-codes_GM431946152.pdfIn PDF document text
    • https://aits.co.id/ckfinder/userfiles/files/roblox-hack-wideos_GM431946152.pdfIn PDF document text
    • https://aits.co.id/ckfinder/userfiles/files/how-much-robux-can-you-get-with-1-million-dollars_GM431946152.pdfIn PDF document text
    • https://aits.co.id/ckfinder/userfiles/files/free-mobile-360-info-roblox_GM431946152.pdfIn PDF document text
    • https://aits.co.id/ckfinder/userfiles/files/hack-fhantom-forces-roblox_GM431946152.pdfIn PDF document text
    • https://aits.co.id/ckfinder/userfiles/files/coin-master-links-that-don-t-expire_GM406889139.pdfIn PDF document text
    • https://aits.co.id/ckfinder/userfiles/files/how-to-win-free-robux_GM431946152.pdfIn PDF document text
    • https://aits.co.id/ckfinder/userfiles/files/free-spins-and-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://aits.co.id/ckfinder/userfiles/files/can-u-get-free-robux_GM431946152.pdfIn PDF document text
    • https://aits.co.id/ckfinder/userfiles/files/coin-master-free-spins-fb_GM406889139.pdfIn PDF document text
    • https://aits.co.id/ckfinder/userfiles/files/do-new-roblox-player-get-robux-for-free_GM431946152.pdfIn PDF document text
    • https://aits.co.id/ckfinder/userfiles/files/roblox-blox-no-hero-academia-how-to-get-free-spins_GM431946152.pdfIn PDF document text
    • https://aits.co.id/ckfinder/userfiles/files/roblox-cheat-engine-phantom-forces_GM431946152.pdfIn PDF document text
    • https://aits.co.id/ckfinder/userfiles/files/free-robux-no-human-verify_GM431946152.pdfIn PDF document text
    • https://aits.co.id/ckfinder/userfiles/files/roblox-games-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • https://aits.co.id/ckfinder/userfiles/files/coin-master-gold-cards-hack_GM406889139.pdfIn PDF document text
    • https://aits.co.id/ckfinder/userfiles/files/minecraft-apk-free-download_GM479516143.pdfIn PDF document text
    • https://aits.co.id/ckfinder/userfiles/files/free-roblox-clothes-templates_GM431946152.pdfIn PDF document text
    • https://aits.co.id/ckfinder/userfiles/files/can-i-get-free-robux_GM431946152.pdfIn PDF document text
    • https://aits.co.id/ckfinder/userfiles/files/how-to-get-free-robux-without-paying_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_off000033f6.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x33F6 23120 bytes
SHA-256: 816aaed2c34e22109bf2cc1b41634d5d2b6736161f51d6d5d301e1e9e3fa8736
font_01_sfnt_off000067dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x67DD 18352 bytes
SHA-256: 4bf67e94d7d6dfdea8b6ca4701ccaf1bd5e348753d7f0670dd6fede0c42c998f

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