Malicious PDF — malware analysis report

Static analysis result for SHA-256 bdedfa2e557f2ce7…

MALICIOUS

PDF

44.5 KB Created: 2021-05-16 10:17:50 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 4eba70a2c6f7f15d5298083fda647c7d SHA-1: dded352ed3bef08a8b83944c8fc02128c818bdcb SHA-256: bdedfa2e557f2ce783342fbb18023564b82d113b7c7fe4f9b7e6183bd618eb61
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 0.9980

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/479516143/minecraft-realms-free-codes-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/479516143/minecraft-realms-free-codes-game-hack PDF link annotation
    • http://www.adudubai.com/uploaded_files/userfiles/files/coin-master-heaven-links_GM406889139.pdfIn PDF document text
    • http://www.adudubai.com/uploaded_files/userfiles/files/coin-master-2021-free-spins-link-today_GM406889139.pdfIn PDF document text
    • http://www.adudubai.com/uploaded_files/userfiles/files/coin-master-free-coins_GM406889139.pdfIn PDF document text
    • http://www.adudubai.com/uploaded_files/userfiles/files/minecraft-pe-texture-packs-free-download_GM479516143.pdfIn PDF document text
    • http://www.adudubai.com/uploaded_files/userfiles/files/can-you-play-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://www.adudubai.com/uploaded_files/userfiles/files/hack-version-coin-master-apk_GM406889139.pdfIn PDF document text
    • http://www.adudubai.com/uploaded_files/userfiles/files/legit-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://www.adudubai.com/uploaded_files/userfiles/files/how-to-get-free-robux-without-verification-or-surveys_GM431946152.pdfIn PDF document text
    • http://www.adudubai.com/uploaded_files/userfiles/files/coin-master-invite-friends-free-spins_GM406889139.pdfIn PDF document text
    • http://www.adudubai.com/uploaded_files/userfiles/files/get-free-spins-coin-master-link_GM406889139.pdfIn PDF document text
    • http://www.adudubai.com/uploaded_files/userfiles/files/worst-roblox-avatars_GM431946152.pdfIn PDF document text
    • http://www.adudubai.com/uploaded_files/userfiles/files/wurst-commands_GM479516143.pdfIn PDF document text
    • http://www.adudubai.com/uploaded_files/userfiles/files/how-to-get-free-spins-on-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://www.adudubai.com/uploaded_files/userfiles/files/avatar-de-roblox_GM431946152.pdfIn PDF document text
    • http://www.adudubai.com/uploaded_files/userfiles/files/como-hackear-coin-master-2021-espaol_GM406889139.pdfIn PDF document text
    • http://www.adudubai.com/uploaded_files/userfiles/files/microsoft-rewards-robux_GM431946152.pdfIn PDF document text
    • http://www.adudubai.com/uploaded_files/userfiles/files/how-to-get-more-robux-for-free_GM431946152.pdfIn PDF document text
    • http://www.adudubai.com/uploaded_files/userfiles/files/google-play-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://www.adudubai.com/uploaded_files/userfiles/files/minecraft-xray-hack_GM479516143.pdfIn PDF document text
    • http://www.adudubai.com/uploaded_files/userfiles/files/girl-roblox-avatar_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_003_off00004cfe.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4CFE 30780 bytes
SHA-256: b41f731db5d20b55595d63f3aae57332becc9c2f6961b9240faf3d4ec0fe26a7
font_01_sfnt_off00008c19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8C19 18216 bytes
SHA-256: 30a8f83054e231b1bb485b1ca025b33fda8ee43bcea67b958af1de796f39c45f

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