Malicious PDF — malware analysis report

Static analysis result for SHA-256 57eb77754cbb81da…

MALICIOUS

PDF

43.8 KB Created: 2021-05-11 07:27:18 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 942453f1bb21cb42463f973eb6c68987 SHA-1: a084c77da16060ce971bbfce3abb9a0f2ffca1a9 SHA-256: 57eb77754cbb81daf5939538e65787349581b9c82c5854b2ccf8de5b42f66d20
260 Risk Score

Malware Insights

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

This PDF document contains numerous links designed to lure users to malicious redirectors, impersonating brands like Office 365 to facilitate credential phishing. The primary malicious URL identified is https://netcdn.xyz/app/479516143/is-minecraft-free-on-mac-game-hack, which is part of a link farm aiming to improve SEO for scam-related content. While no scripts were explicitly extracted, the PDF structure and embedded links strongly suggest an attempt to exploit users through deceptive content and potentially drive-by downloads or further malicious redirects.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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/is-minecraft-free-on-mac-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/is-minecraft-free-on-mac-game-hack In PDF document text
    • http://www.sfakia-online.com/images/roblox-free-robux-codes_GM431946152.pdfIn PDF document text
    • http://www.sfakia-online.com/images/free-roblox-usernames-and-passwords_GM431946152.pdfIn PDF document text
    • http://www.sfakia-online.com/images/minecraft-pe-texture-packs-free-download_GM479516143.pdfIn PDF document text
    • http://www.sfakia-online.com/images/how-to-get-minecraft-for-free-on-computer_GM479516143.pdfIn PDF document text
    • http://www.sfakia-online.com/images/clean-master-hack-coins_GM406889139.pdfIn PDF document text
    • http://www.sfakia-online.com/images/minecraft-hax-download-no-virus_GM479516143.pdfIn PDF document text
    • http://www.sfakia-online.com/images/coin-master-hack-org_GM406889139.pdfIn PDF document text
    • http://www.sfakia-online.com/images/free-robux-codes-no-verification_GM431946152.pdfIn PDF document text
    • http://www.sfakia-online.com/images/get-2021-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://www.sfakia-online.com/images/roblox-script-hack_GM431946152.pdfIn PDF document text
    • http://www.sfakia-online.com/images/coin-master-support_GM406889139.pdfIn PDF document text
    • http://www.sfakia-online.com/images/how-to-get-free-robux-no-human-verification_GM431946152.pdfIn PDF document text
    • http://www.sfakia-online.com/images/free-gold-cards-for-coin-master_GM406889139.pdfIn PDF document text
    • http://www.sfakia-online.com/images/free-spin-coin-master-today_GM406889139.pdfIn PDF document text
    • http://www.sfakia-online.com/images/free-spins-and-coins-for-coin-master-game_GM406889139.pdfIn PDF document text
    • http://www.sfakia-online.com/images/how-to-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://www.sfakia-online.com/images/free-spin-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://www.sfakia-online.com/images/coin-master-free-coins--spins_GM406889139.pdfIn PDF document text
    • http://www.sfakia-online.com/images/the-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://www.sfakia-online.com/images/games-that-give-you-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_003_off00004ab9.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4AB9 28796 bytes
SHA-256: c725eb059b0a5298dbe72df1dad283535f0aa1003ed011fbf28e1545b73edd7f
font_01_sfnt_off00008b48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8B48 17568 bytes
SHA-256: 70928c98edb580837fcbf0f9543b841edd11efdac6de6b6fcc7c93cea73d6057

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