Malicious PDF — malware analysis report

Static analysis result for SHA-256 53805ead3585289d…

MALICIOUS

PDF

34.4 KB Created: 2021-07-04 03:37:55 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 914737974d4fe609628922e0fc0b798a SHA-1: 4269be20423fbf9eb1cdb3da0a22e09198ceb0a7 SHA-256: 53805ead3585289d87818399e63974e3339f0a525c06a2807fb71a1dbffc92bd
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains multiple links to known malicious redirectors, disguised as "free generators" or "game hacks" for popular games like Coin Master and Roblox. The document body and embedded URLs strongly suggest a phishing or scam attempt to lure users to malicious infrastructure. The ML classifier also flagged this PDF with high confidence.

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/official-coin-master-free-spins-game-hack In PDF document text
    • http://clinicamanila.com/ckfinder/userfiles/files/free-printable-minecraft-coloring-pages_GM479516143.pdfIn PDF document text
    • http://clinicamanila.com/ckfinder/userfiles/files/how-to-make-a-dll-hack-for-roblox_GM431946152.pdfIn PDF document text
    • http://clinicamanila.com/ckfinder/userfiles/files/free-roblox-assassin-codes_GM431946152.pdfIn PDF document text
    • http://clinicamanila.com/ckfinder/userfiles/files/how-to-cheat-lots-of-robloxs_GM431946152.pdfIn PDF document text
    • http://clinicamanila.com/ckfinder/userfiles/files/coin-master-time-speed-hack_GM406889139.pdfIn PDF document text
    • http://clinicamanila.com/ckfinder/userfiles/files/games-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://clinicamanila.com/ckfinder/userfiles/files/free-robux-real_GM431946152.pdfIn PDF document text
    • http://clinicamanila.com/ckfinder/userfiles/files/free-robux-easy_GM431946152.pdfIn PDF document text
    • http://clinicamanila.com/ckfinder/userfiles/files/coin-master-free-bonus_GM406889139.pdfIn PDF document text
    • http://clinicamanila.com/ckfinder/userfiles/files/free-spins-coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • http://clinicamanila.com/ckfinder/userfiles/files/how-to-get-free-cash-in-boku-no-roblox_GM431946152.pdfIn PDF document text
    • http://clinicamanila.com/ckfinder/userfiles/files/roblox-games-free-online-to-play_GM431946152.pdfIn PDF document text
    • http://clinicamanila.com/ckfinder/userfiles/files/how-to-get-free-robux-no-verification-2021_GM431946152.pdfIn PDF document text
    • http://clinicamanila.com/ckfinder/userfiles/files/hacks-for-falling-that-actually-work-roblox_GM431946152.pdfIn PDF document text
    • http://clinicamanila.com/ckfinder/userfiles/files/how-to-hack-roblox-accounts-2021-easy_GM431946152.pdfIn PDF document text
    • http://clinicamanila.com/ckfinder/userfiles/files/free-spins-coin-master-october-17-2021_GM406889139.pdfIn PDF document text
    • http://clinicamanila.com/ckfinder/userfiles/files/someone-hacked-my-robux-again_GM431946152.pdfIn PDF document text
    • http://clinicamanila.com/ckfinder/userfiles/files/robux-hack-me_GM431946152.pdfIn PDF document text
    • http://clinicamanila.com/ckfinder/userfiles/files/anarchy-roblox-hacks-site-v3rmillionnet_GM431946152.pdfIn PDF document text
    • http://clinicamanila.com/ckfinder/userfiles/files/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
font_00_sfnt_off00003171.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3171 22608 bytes
SHA-256: a2940224290e631dba20b247ca524b3936629aefb204b8acd4e2581ab96d733b
font_01_sfnt_off0000641a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x641A 18248 bytes
SHA-256: e2af4311d6ae554e108bc57162be2fbf4f2b9d1fcb74cec0c85fa594686723eb

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