Malicious PDF — malware analysis report

Static analysis result for SHA-256 6241aa347bba04a6…

MALICIOUS

PDF

40.9 KB Created: 2021-05-14 02:51:49 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 59211fc6ddb8c0fd2de2f5d05ad321c6 SHA-1: 0026b8b54aebf0676e0f0d232dd4817cf10480d1 SHA-256: 6241aa347bba04a6ba9c3630f225bbfb22db3a77aa86c2ea9d42b633e587898b
260 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document employs a fake CAPTCHA lure to deceive users into interacting with malicious links. The document contains numerous links to external PDF files hosted on potentially compromised websites, suggesting a link farm or redirector strategy. The primary malicious URL identified is https://netcdn.xyz/app/406889139/fighting-free-card-coin-master-game-hack, which is likely part of a scam or malware distribution chain.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 6

  • 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.
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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/406889139/fighting-free-card-coin-master-game-hack In PDF document text
    • http://huebner-baustoffe.de/images/free-robux-codes-no-human-verification_GM431946152.pdfIn PDF document text
    • http://huebner-baustoffe.de/images/coin-master-free-spins-daily_GM406889139.pdfIn PDF document text
    • http://huebner-baustoffe.de/images/easy-how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://huebner-baustoffe.de/images/coin-master-apk-hack-3527_GM406889139.pdfIn PDF document text
    • http://huebner-baustoffe.de/images/how-to-get-free-robux-without-downloading-apps-2021_GM431946152.pdfIn PDF document text
    • http://huebner-baustoffe.de/images/how-can-i-get-robux_GM431946152.pdfIn PDF document text
    • http://huebner-baustoffe.de/images/how-to-get-unlimited-robux-2021_GM431946152.pdfIn PDF document text
    • http://huebner-baustoffe.de/images/coin-master-hacks-for-spins_GM406889139.pdfIn PDF document text
    • http://huebner-baustoffe.de/images/20210-free-spin-links-for-coin-master_GM406889139.pdfIn PDF document text
    • http://huebner-baustoffe.de/images/how-to-get-free-cards-for-coin-master_GM406889139.pdfIn PDF document text
    • http://huebner-baustoffe.de/images/how-to-get-real-robux_GM431946152.pdfIn PDF document text
    • http://huebner-baustoffe.de/images/moonactive-free-spins-link_GM406889139.pdfIn PDF document text
    • http://huebner-baustoffe.de/images/how-to-hack-roblox-to-get-robux_GM431946152.pdfIn PDF document text
    • http://huebner-baustoffe.de/images/easy-robux-hack_GM431946152.pdfIn PDF document text
    • http://huebner-baustoffe.de/images/roblox-redeem-card-codes-free_GM431946152.pdfIn PDF document text
    • http://huebner-baustoffe.de/images/free-robux-redeem-codes_GM431946152.pdfIn PDF document text
    • http://huebner-baustoffe.de/images/free-roblox-intros_GM431946152.pdfIn PDF document text
    • http://huebner-baustoffe.de/images/minecraft-bedrock-edition-pc-free_GM479516143.pdfIn PDF document text
    • http://huebner-baustoffe.de/images/free-pet-food-on-coin-master_GM406889139.pdfIn PDF document text
    • http://huebner-baustoffe.de/images/coin-master-claim-free-spins_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
stream_003_off00004636.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4636 24944 bytes
SHA-256: 3f41d069d2ac9677b469fc316acc273732801abb811cce3551b1e141f232c9c7
font_01_sfnt_off00007d69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7D69 18336 bytes
SHA-256: f0cd4d6bae61bb9f7721c88e5b38a7df4c9de99d8fb8d81dbaccb772e8fa5d98

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