Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c479d4105c05d9b…

MALICIOUS

PDF

45.8 KB Created: 2021-05-12 17:10:03 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-20
MD5: d1d9af35e309317f68b247051077307b SHA-1: a19b8046456a6bc26d7581cbb2af98b7a15d8f64 SHA-256: 0c479d4105c05d9b759b0b43f5fa0056eadd434ce5d248cd6bfacd633b27cd53
260 Risk Score

Malware Insights

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

This PDF document contains multiple links designed to lure users into clicking on what appear to be free game item generators or account lists. The primary redirector URL, https://netcdn.xyz/app/479516143/free-minecraft-account-list-game-hack, is associated with malicious redirector infrastructure and impersonates brands like Microsoft. The document body, though heavily obfuscated, contains references to these lures and the authoring application, wkhtmltopdf, suggesting it was generated programmatically to host these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9432

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/479516143/free-minecraft-account-list-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/479516143/free-minecraft-account-list-game-hack In PDF document text
    • https://nutrafeliz.cl/ckfinder/userfiles/files/coin-master-free-spin-and-coins-links-2021_GM406889139.pdfIn PDF document text
    • https://nutrafeliz.cl/ckfinder/userfiles/files/minecraft-bedrock-hacks_GM479516143.pdfIn PDF document text
    • https://nutrafeliz.cl/ckfinder/userfiles/files/how-to-get-minecraft-for-free-on-phone_GM479516143.pdfIn PDF document text
    • https://nutrafeliz.cl/ckfinder/userfiles/files/minecraft-free-education_GM479516143.pdfIn PDF document text
    • https://nutrafeliz.cl/ckfinder/userfiles/files/how-to-download-minecraft-windows-10-edition-for-free_GM479516143.pdfIn PDF document text
    • https://nutrafeliz.cl/ckfinder/userfiles/files/coin-master-free-spins-blogspot_GM406889139.pdfIn PDF document text
    • https://nutrafeliz.cl/ckfinder/userfiles/files/coin-master-free-items_GM406889139.pdfIn PDF document text
    • https://nutrafeliz.cl/ckfinder/userfiles/files/how-to-get-free-robux-no-survey_GM431946152.pdfIn PDF document text
    • https://nutrafeliz.cl/ckfinder/userfiles/files/como-hackear-coin-master-sin-verificacion-humana_GM406889139.pdfIn PDF document text
    • https://nutrafeliz.cl/ckfinder/userfiles/files/free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • https://nutrafeliz.cl/ckfinder/userfiles/files/hack-coin-master-no-verification_GM406889139.pdfIn PDF document text
    • https://nutrafeliz.cl/ckfinder/userfiles/files/free-spins-coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • https://nutrafeliz.cl/ckfinder/userfiles/files/free-attacks-on-coin-master_GM406889139.pdfIn PDF document text
    • https://nutrafeliz.cl/ckfinder/userfiles/files/how-to-get-free-robux-without-download-apps-or-survey_GM431946152.pdfIn PDF document text
    • https://nutrafeliz.cl/ckfinder/userfiles/files/coin-master-hack-blogspot_GM406889139.pdfIn PDF document text
    • https://nutrafeliz.cl/ckfinder/userfiles/files/coin-master-hack-app-ios-download_GM406889139.pdfIn PDF document text
    • https://nutrafeliz.cl/ckfinder/userfiles/files/coin-master-heaven-daily-free-spins-link-today_GM406889139.pdfIn PDF document text
    • https://nutrafeliz.cl/ckfinder/userfiles/files/legit-coin-master-hack-october-2021_GM406889139.pdfIn PDF document text
    • https://nutrafeliz.cl/ckfinder/userfiles/files/how-to-get-free-spins-on-coin-master-without-verification_GM406889139.pdfIn PDF document text
    • https://nutrafeliz.cl/ckfinder/userfiles/files/free-spins-from-coin-master_GM406889139.pdfIn PDF document text
    • http://www.freenom.comHeyIn 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_off00004f90.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4F90 25072 bytes
SHA-256: 40912ad9c89382c18411470e66da009b8101751b2a7fc466a2affff7eaf302fa
font_01_sfnt_off0000882a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x882A 2856 bytes
SHA-256: 8c5d9bcb386d88c7f99323d8d482e46ea21dea038a5b842744dd5d39b26b2c44
font_02_sfnt_off00009200.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9200 17848 bytes
SHA-256: 5b1d54360e857fbda0e30a3304c93394a8bc996e2a6fac27502c58fec3e6bef5

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