Malicious PDF — malware analysis report

Static analysis result for SHA-256 76b4b077ff95f263…

MALICIOUS

PDF

35.9 KB Created: 2021-06-19 19:02:30 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-16
MD5: eadbb2946e6e0198ccfdb5ec6fbd03e5 SHA-1: 0a519716d76dba43eadef9cf2d765e4a93d10a35 SHA-256: 76b4b077ff95f263e8c50e3a92f824e36b83a15731baf7f9b59e94f349b54cc8
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a link that is flagged as a malicious redirector, specifically advertising a "free generator / game hack" for Minecraft. This lure is designed to entice users to click through to potentially harmful content. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the embedded URL is the primary indicator of compromise.

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/479516143/minecraft-java-edition-redeem-code-free-2021-game-hack In PDF document text
    • https://www.st-leonards-stafford.staffs.sch.uk/admin/ckfinder/userfiles/files/coin-master-free-blogspot_GM406889139.pdfIn PDF document text
    • https://www.st-leonards-stafford.staffs.sch.uk/admin/ckfinder/userfiles/files/free-robux-without-human-verification-real_GM431946152.pdfIn PDF document text
    • https://www.st-leonards-stafford.staffs.sch.uk/admin/ckfinder/userfiles/files/i-want-free-robux_GM431946152.pdfIn PDF document text
    • https://www.st-leonards-stafford.staffs.sch.uk/admin/ckfinder/userfiles/files/coin-master-free-spins-and-free-coins_GM406889139.pdfIn PDF document text
    • https://www.st-leonards-stafford.staffs.sch.uk/admin/ckfinder/userfiles/files/coin-master-attack-block-hack_GM406889139.pdfIn PDF document text
    • https://www.st-leonards-stafford.staffs.sch.uk/admin/ckfinder/userfiles/files/haktuts-coin-master-free-spin-today_GM406889139.pdfIn PDF document text
    • https://www.st-leonards-stafford.staffs.sch.uk/admin/ckfinder/userfiles/files/how-do-you-get-free-roblox_GM431946152.pdfIn PDF document text
    • https://www.st-leonards-stafford.staffs.sch.uk/admin/ckfinder/userfiles/files/no-human-verification-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://www.st-leonards-stafford.staffs.sch.uk/admin/ckfinder/userfiles/files/is-pokemon-free_GM1094591345.pdfIn PDF document text
    • https://www.st-leonards-stafford.staffs.sch.uk/admin/ckfinder/userfiles/files/free-roblox-accounts-with-robux_GM431946152.pdfIn PDF document text
    • https://www.st-leonards-stafford.staffs.sch.uk/admin/ckfinder/userfiles/files/pokemon-go-free-pokeballs-promo-code_GM1094591345.pdfIn PDF document text
    • https://www.st-leonards-stafford.staffs.sch.uk/admin/ckfinder/userfiles/files/free-robux-net_GM431946152.pdfIn PDF document text
    • https://www.st-leonards-stafford.staffs.sch.uk/admin/ckfinder/userfiles/files/how-to-get-100-robux-for-free_GM431946152.pdfIn PDF document text
    • https://www.st-leonards-stafford.staffs.sch.uk/admin/ckfinder/userfiles/files/coin-master-hack-pro_GM406889139.pdfIn PDF document text
    • https://www.st-leonards-stafford.staffs.sch.uk/admin/ckfinder/userfiles/files/boost9-com-roblox-hack_GM431946152.pdfIn PDF document text
    • https://www.st-leonards-stafford.staffs.sch.uk/admin/ckfinder/userfiles/files/roblox-free-robux-generator_GM431946152.pdfIn PDF document text
    • https://www.st-leonards-stafford.staffs.sch.uk/admin/ckfinder/userfiles/files/free-adidas-asset-roblox_GM431946152.pdfIn PDF document text
    • https://www.st-leonards-stafford.staffs.sch.uk/admin/ckfinder/userfiles/files/cute-free-hair-on-roblox_GM431946152.pdfIn PDF document text
    • https://www.st-leonards-stafford.staffs.sch.uk/admin/ckfinder/userfiles/files/coin-master-free-coins-and-spins-daily-summary_GM406889139.pdfIn PDF document text
    • https://www.st-leonards-stafford.staffs.sch.uk/admin/ckfinder/userfiles/files/minecraft-free-apk_GM479516143.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_off00003537.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3537 22516 bytes
SHA-256: 70c5fda0a9416f5342a8cfb2d6a5b14595142b10a15fa88e686578bfa56df2ff
font_01_sfnt_off00006755.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6755 19116 bytes
SHA-256: a2b86775a090322cefa709cc1fcca9712d09ee5c8c945508c2446f9382ffb316