Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c2631e9cb239935…

MALICIOUS

PDF

43.1 KB Created: 2021-05-16 11:03:03 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 432d5079b9dad7b3372903fccc291e8d SHA-1: 33f757093eb0a3b11b93022dac7a44b82f2105e8 SHA-256: 9c2631e9cb239935f80f4bb76b465638935c7ee0ce62ab0ca915209e02a1ec10
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains numerous links to external websites, many of which are SEO-optimized PDFs, and a primary redirector URL. The document body and heuristic firings indicate a lure for game-related cheats and currency, suggesting a phishing or malware distribution attempt. The presence of embedded URLs and the nature of the linked content strongly suggest a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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 https://netcdn.xyz/app/431946152/robux-offers-game-hack In PDF document text
    • http://smpn1-dps.sch.id/new/public/ckfinder/userfiles/files/free-account-roblox-2021_GM431946152.pdfIn PDF document text
    • http://smpn1-dps.sch.id/new/public/ckfinder/userfiles/files/girl-roblox-avatar_GM431946152.pdfIn PDF document text
    • http://smpn1-dps.sch.id/new/public/ckfinder/userfiles/files/free-spins-on-coin-master-game_GM406889139.pdfIn PDF document text
    • http://smpn1-dps.sch.id/new/public/ckfinder/userfiles/files/how-to-hack-roblox-accounts_GM431946152.pdfIn PDF document text
    • http://smpn1-dps.sch.id/new/public/ckfinder/userfiles/files/how-to-hack-a-minecraft-server_GM479516143.pdfIn PDF document text
    • http://smpn1-dps.sch.id/new/public/ckfinder/userfiles/files/coin-master-free-spins-no-human-verification_GM406889139.pdfIn PDF document text
    • http://smpn1-dps.sch.id/new/public/ckfinder/userfiles/files/websites-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://smpn1-dps.sch.id/new/public/ckfinder/userfiles/files/legit-coin-master-hack-no-human-verification_GM406889139.pdfIn PDF document text
    • http://smpn1-dps.sch.id/new/public/ckfinder/userfiles/files/free-robux-for-kids-no-verification_GM431946152.pdfIn PDF document text
    • http://smpn1-dps.sch.id/new/public/ckfinder/userfiles/files/cool-free-minecraft-skins_GM479516143.pdfIn PDF document text
    • http://smpn1-dps.sch.id/new/public/ckfinder/userfiles/files/how-to-get-free-robux-on-iphone_GM431946152.pdfIn PDF document text
    • http://smpn1-dps.sch.id/new/public/ckfinder/userfiles/files/free-spins-october-28-2021-coin-master_GM406889139.pdfIn PDF document text
    • http://smpn1-dps.sch.id/new/public/ckfinder/userfiles/files/roblox-hack-apk_GM431946152.pdfIn PDF document text
    • http://smpn1-dps.sch.id/new/public/ckfinder/userfiles/files/coin-master-hack-software-download_GM406889139.pdfIn PDF document text
    • http://smpn1-dps.sch.id/new/public/ckfinder/userfiles/files/free-spin-appscoin-master_GM406889139.pdfIn PDF document text
    • http://smpn1-dps.sch.id/new/public/ckfinder/userfiles/files/how-do-you-get-free-robux-without-doing-anything_GM431946152.pdfIn PDF document text
    • http://smpn1-dps.sch.id/new/public/ckfinder/userfiles/files/free-minecraft-skins-pe_GM479516143.pdfIn PDF document text
    • http://smpn1-dps.sch.id/new/public/ckfinder/userfiles/files/coin-master-rewards_GM406889139.pdfIn PDF document text
    • http://smpn1-dps.sch.id/new/public/ckfinder/userfiles/files/coin-master-hack-online-cheat_GM406889139.pdfIn PDF document text
    • http://smpn1-dps.sch.id/new/public/ckfinder/userfiles/files/www-robux-us_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_off00004cbf.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4CBF 25652 bytes
SHA-256: 5b2f4b3c7d4f0d04e3b1052ffc3e34b752494dd8cbd571447adec94811d05913
font_01_sfnt_off00008795.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8795 17852 bytes
SHA-256: d996fede43d0fc1a5403a574ed382013adeb188792274686644c4f79c5d24ca5

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