Malicious PDF — malware analysis report

Static analysis result for SHA-256 83e0c7e4845c0b9a…

MALICIOUS

PDF

43.7 KB Created: 2021-05-12 20:14:56 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 6e6fed0f4b0e773f8981610eceb24689 SHA-1: 2976eb2a81a4ff561693f6fc0c380077fd48aa27 SHA-256: 83e0c7e4845c0b9a3788d82458cde6de671776a3c459cd86daf326826f1bec94
182 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by an ML classifier. It uses brand-impersonation credential phishing. The file embeds a large number of external links characteristic of an SEO link farm, routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

Heuristics 6

  • 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.
  • PDF links to a 'free generator / game hack' redirector high 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.
  • 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/roblox-catalog-free-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
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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/roblox-catalog-free-game-hack PDF link annotation
    • https://pelatihsenamjogja.com/ckfinder/userfiles/files/get-robux-today_GM431946152.pdfIn PDF document text
    • https://pelatihsenamjogja.com/ckfinder/userfiles/files/how-to-hack-in-roblox-prison-life_GM431946152.pdfIn PDF document text
    • https://pelatihsenamjogja.com/ckfinder/userfiles/files/minecraft-pocket-edition-free-apk_GM479516143.pdfIn PDF document text
    • https://pelatihsenamjogja.com/ckfinder/userfiles/files/coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • https://pelatihsenamjogja.com/ckfinder/userfiles/files/minecraft-free-download-no-virus_GM479516143.pdfIn PDF document text
    • https://pelatihsenamjogja.com/ckfinder/userfiles/files/can-lucky-patcher-hack-coin-master_GM406889139.pdfIn PDF document text
    • https://pelatihsenamjogja.com/ckfinder/userfiles/files/robux-free-gift-card-org-hack_GM431946152.pdfIn PDF document text
    • https://pelatihsenamjogja.com/ckfinder/userfiles/files/free-coin-master-spins-link_GM406889139.pdfIn PDF document text
    • https://pelatihsenamjogja.com/ckfinder/userfiles/files/how-to-download-minecraft-java-edition-for-free_GM479516143.pdfIn PDF document text
    • https://pelatihsenamjogja.com/ckfinder/userfiles/files/coin-master-daily-free-spins-link-today-blog_GM406889139.pdfIn PDF document text
    • https://pelatihsenamjogja.com/ckfinder/userfiles/files/free-robux-no-verification-required_GM431946152.pdfIn PDF document text
    • https://pelatihsenamjogja.com/ckfinder/userfiles/files/coin-master-free-coins-2021_GM406889139.pdfIn PDF document text
    • https://pelatihsenamjogja.com/ckfinder/userfiles/files/free-robux-codes_GM431946152.pdfIn PDF document text
    • https://pelatihsenamjogja.com/ckfinder/userfiles/files/coin-master-free-spin-and-trading-group_GM406889139.pdfIn PDF document text
    • https://pelatihsenamjogja.com/ckfinder/userfiles/files/coin-master-daily-free-spins-link-facebook_GM406889139.pdfIn PDF document text
    • https://pelatihsenamjogja.com/ckfinder/userfiles/files/google-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • https://pelatihsenamjogja.com/ckfinder/userfiles/files/free-robux-clothes_GM431946152.pdfIn PDF document text
    • https://pelatihsenamjogja.com/ckfinder/userfiles/files/completed-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://pelatihsenamjogja.com/ckfinder/userfiles/files/coin-master-hack_GM406889139.pdfIn PDF document text
    • https://pelatihsenamjogja.com/ckfinder/userfiles/files/coin-master-hack-mod-apk-2021_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004a6f.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4A6F 26652 bytes
SHA-256: cbabde66d380d7320929ad6a36f40bb801f1d6461db4fb0a7b8d6639e7097638
font_01_sfnt_off00008797.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8797 18568 bytes
SHA-256: cc0ec05b5d894eed425ecb009154fe3a24429e4f12fa9e055098e5230d714ed6

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