Malicious PDF — malware analysis report

Static analysis result for SHA-256 7eb31f2684568c5d…

MALICIOUS

PDF

48.6 KB Created: 2021-05-14 18:30:33 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-16
MD5: b0a241f96f3a1755d34d662c4b08861a SHA-1: fc0e402febe183c549dda4478d019ddded7c78d8 SHA-256: 7eb31f2684568c5d4173991e641514c4c8dd5030647fab09f4e14aabf981a6b8
260 Risk Score

Malware Insights

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

The PDF file contains multiple heuristics indicating malicious intent, including a critical finding for a PDF game hack redirector lure and a brand impersonation for credential phishing. The document body, though partially corrupted, contains text related to 'free Robux' and a URL that aligns with the phishing lure. The presence of embedded URLs and the overall structure suggest an attempt to redirect users to malicious infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9013

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.
  • Brand-impersonation credential phishing lure high SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: call-to-action link host does not match the impersonated brand: https://netcdn.xyz/app/431946152/how-do-you-get-free-robux-on-roblox-game-hack.
  • 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/how-do-you-get-free-robux-on-roblox-game-hack In PDF document text
    • http://dndprinting.com/new/public/ckfinder/userfiles/files/free-robux-link_GM431946152.pdfIn PDF document text
    • http://dndprinting.com/new/public/ckfinder/userfiles/files/coin-master-free-spins-link-2021-download_GM406889139.pdfIn PDF document text
    • http://dndprinting.com/new/public/ckfinder/userfiles/files/how-to-make-free-robux_GM431946152.pdfIn PDF document text
    • http://dndprinting.com/new/public/ckfinder/userfiles/files/how-to-get-roblox-premium-for-free_GM431946152.pdfIn PDF document text
    • http://dndprinting.com/new/public/ckfinder/userfiles/files/free-vpn-for-minecraft_GM479516143.pdfIn PDF document text
    • http://dndprinting.com/new/public/ckfinder/userfiles/files/roblox-free-items-glitch_GM431946152.pdfIn PDF document text
    • http://dndprinting.com/new/public/ckfinder/userfiles/files/minecraft-nintendo-switch-digital-code-free_GM479516143.pdfIn PDF document text
    • http://dndprinting.com/new/public/ckfinder/userfiles/files/coin-master-free-spins-and-coins_GM406889139.pdfIn PDF document text
    • http://dndprinting.com/new/public/ckfinder/userfiles/files/free-spins-for-coin-master-on-1-19-19_GM406889139.pdfIn PDF document text
    • http://dndprinting.com/new/public/ckfinder/userfiles/files/coin-master-free-coin-hack_GM406889139.pdfIn PDF document text
    • http://dndprinting.com/new/public/ckfinder/userfiles/files/hack-crack-for-coin-master-currency_GM406889139.pdfIn PDF document text
    • http://dndprinting.com/new/public/ckfinder/userfiles/files/how-to-get-free-shields-on-coin-master_GM406889139.pdfIn PDF document text
    • http://dndprinting.com/new/public/ckfinder/userfiles/files/www-claim-gg-to-earn-free-robux_GM431946152.pdfIn PDF document text
    • http://dndprinting.com/new/public/ckfinder/userfiles/files/robux-hacks-2021_GM431946152.pdfIn PDF document text
    • http://dndprinting.com/new/public/ckfinder/userfiles/files/free-robux-codes-generator_GM431946152.pdfIn PDF document text
    • http://dndprinting.com/new/public/ckfinder/userfiles/files/how-to-download-minecraft-java-edition-for-free_GM479516143.pdfIn PDF document text
    • http://dndprinting.com/new/public/ckfinder/userfiles/files/free-roblox-script-executor_GM431946152.pdfIn PDF document text
    • http://dndprinting.com/new/public/ckfinder/userfiles/files/free-roblox-shirts-templates_GM431946152.pdfIn PDF document text
    • http://dndprinting.com/new/public/ckfinder/userfiles/files/free-robux-2021-no-human-verification_GM431946152.pdfIn PDF document text
    • http://dndprinting.com/new/public/ckfinder/userfiles/files/coin-master-hack-online-download_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004b91.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4B91 28500 bytes
SHA-256: 248aeb6fdb47f2b00058a358df4bb67e1ea0da822e48af0c4c2a00ae9afd2771
font_01_sfnt_off00008d2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8D2D 5696 bytes
SHA-256: 450e3ee45915afe13702bf1d587eb8b9ad88a8d2113419ac9f2fd116a828e139
font_02_sfnt_off00009a3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9A3E 18688 bytes
SHA-256: 1a1edbb4620230d43f84097700922ea11c75fa5ad69815b80eb1b16329c7dce0

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