Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c3c85fda730f02b…

MALICIOUS

PDF

35.8 KB Created: 2021-06-19 11:53:37 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: bc535a2da73ff0d314c71e0206d2d77e SHA-1: 7e7b57e49f958caecd7803dfeec45ef04bc8f680 SHA-256: 8c3c85fda730f02be82f36bcc396b04e718f15cb5bd742a2c70fb92b8229243e
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains a lure for a 'game hack generator' and embeds a link to known malicious redirector infrastructure. The document body and heuristics indicate the primary goal is to redirect the user to the malicious URL, likely to download further malware or engage in phishing. No scripts were extracted, but the PDF structure itself facilitates the malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 4

  • 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.
  • 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.co/app/406889139/hackear-juego-coin-master-espaol-game-hack In PDF document text
    • https://www.urcouponsdeal.com/2019/03/coin-master-free-spin-and-coin-links.htmlIn PDF document text
    • https://www.allsaints-denstone.staffs.sch.uk/admin/ckfinder/userfiles/files/pubg-uc-image_GM1330123889.pdfIn PDF document text
    • https://www.allsaints-denstone.staffs.sch.uk/admin/ckfinder/userfiles/files/www-roblox-robux_GM431946152.pdfIn PDF document text
    • https://www.allsaints-denstone.staffs.sch.uk/admin/ckfinder/userfiles/files/coin-master-free-cards_GM406889139.pdfIn PDF document text
    • https://www.allsaints-denstone.staffs.sch.uk/admin/ckfinder/userfiles/files/coin-master-free-spin-link-list_GM406889139.pdfIn PDF document text
    • https://www.allsaints-denstone.staffs.sch.uk/admin/ckfinder/userfiles/files/free-mods-for-minecraft-pe_GM479516143.pdfIn PDF document text
    • https://www.allsaints-denstone.staffs.sch.uk/admin/ckfinder/userfiles/files/free-robux-working_GM431946152.pdfIn PDF document text
    • https://www.allsaints-denstone.staffs.sch.uk/admin/ckfinder/userfiles/files/robux-fun-hack_GM431946152.pdfIn PDF document text
    • https://www.allsaints-denstone.staffs.sch.uk/admin/ckfinder/userfiles/files/how-to-hack-roblox-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://www.allsaints-denstone.staffs.sch.uk/admin/ckfinder/userfiles/files/roblox-games-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • https://www.allsaints-denstone.staffs.sch.uk/admin/ckfinder/userfiles/files/tiktok-free-folowers-joker_GM835599320.pdfIn PDF document text
    • https://www.allsaints-denstone.staffs.sch.uk/admin/ckfinder/userfiles/files/get-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://www.allsaints-denstone.staffs.sch.uk/admin/ckfinder/userfiles/files/free-robux-codes-2021_GM431946152.pdfIn PDF document text
    • https://www.allsaints-denstone.staffs.sch.uk/admin/ckfinder/userfiles/files/free-robux-accounts_GM431946152.pdfIn PDF document text
    • https://www.allsaints-denstone.staffs.sch.uk/admin/ckfinder/userfiles/files/how-to-get-free-robux-easy_GM431946152.pdfIn PDF document text
    • https://www.allsaints-denstone.staffs.sch.uk/admin/ckfinder/userfiles/files/minecraft-bedrock-hacks_GM479516143.pdfIn PDF document text
    • https://www.allsaints-denstone.staffs.sch.uk/admin/ckfinder/userfiles/files/roblox-trolling_GM431946152.pdfIn PDF document text
    • https://www.allsaints-denstone.staffs.sch.uk/admin/ckfinder/userfiles/files/minecraft-java-code-free_GM479516143.pdfIn PDF document text
    • https://www.allsaints-denstone.staffs.sch.uk/admin/ckfinder/userfiles/files/minecraft-java-edition-download-free_GM479516143.pdfIn PDF document text
    • https://www.allsaints-denstone.staffs.sch.uk/admin/ckfinder/userfiles/files/free-minecraft-com_GM479516143.pdfIn PDF document text
    • https://www.allsaints-denstone.staffs.sch.uk/admin/ckfinder/userfiles/files/roblox-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
stream_002_off000032d7.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x32D7 23704 bytes
SHA-256: 8b0be8eb5a13c2cc1522f0f9423a3cb8785f87cf3f74eccae5b09ebfcbf4d7fb
font_01_sfnt_off000068b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x68B7 18560 bytes
SHA-256: f3f60b7b9b4ab5300b3cd48d5516a8b50a21fa71edf56a6ac10336b4bdb9bd79