Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b113e4261d98b38…

MALICIOUS

PDF

49.7 KB Created: 2021-06-02 07:30:05 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-25
MD5: e53469fb90a24a17c22171a6c7daab93 SHA-1: 6f158752a522146fe15c02e9f8b39422aee5ff6c SHA-256: 7b113e4261d98b38b4c8f3c27a7573cf667f37082db96a111f99c3edbca38507
200 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file contains multiple links to redirector infrastructure, specifically promoting 'free generator / game hack' lures. The document impersonates the brand Apple while directing users to a suspicious URL, indicating a credential phishing or scam attempt. The presence of multiple malicious redirector links and the ML classifier's high confidence score support this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9751

Heuristics 5

  • 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.
  • 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/free-roblox-robux-codes-2021-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/431946152/free-roblox-robux-codes-2021-game-hack In PDF document text
    • http://zercalo.org/images/coin-master-free-spins-haktuts_GM406889139.pdfIn PDF document text
    • http://zercalo.org/images/minecraft-java-edition-free-code_GM479516143.pdfIn PDF document text
    • http://zercalo.org/images/twitter-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://zercalo.org/images/claim-free-robux_GM431946152.pdfIn PDF document text
    • http://zercalo.org/images/coin-master-free-spins-daily-fb-champion_GM406889139.pdfIn PDF document text
    • http://zercalo.org/images/minecraft-free-download-ios_GM479516143.pdfIn PDF document text
    • http://zercalo.org/images/roblox-avatar-maker-free_GM431946152.pdfIn PDF document text
    • http://zercalo.org/images/minecraft-for-ipad-free_GM479516143.pdfIn PDF document text
    • http://zercalo.org/images/coin-master-free-coins-and-spins_GM406889139.pdfIn PDF document text
    • http://zercalo.org/images/free-robux-websites-that-actually-work-2021_GM431946152.pdfIn PDF document text
    • http://zercalo.org/images/free-roblox-com_GM431946152.pdfIn PDF document text
    • http://zercalo.org/images/free-robux-discord-servers_GM431946152.pdfIn PDF document text
    • http://zercalo.org/images/how-to-hack-roblox-accounts-for-robux_GM431946152.pdfIn PDF document text
    • http://zercalo.org/images/free-promo-codes-for-robux_GM431946152.pdfIn PDF document text
    • http://zercalo.org/images/how-to-get-free-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://zercalo.org/images/coinmaster-spin-ml-link_GM406889139.pdfIn PDF document text
    • http://zercalo.org/images/free-robux-quiz_GM431946152.pdfIn PDF document text
    • http://zercalo.org/images/coin-master-heaven-free-spins-today_GM406889139.pdfIn PDF document text
    • http://zercalo.org/images/coin-master-hack-1021_GM406889139.pdfIn PDF document text
    • http://zercalo.org/images/how-do-you-hack-roblox_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00004cbf.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4CBF 25848 bytes
SHA-256: e4a7bee3c51ee9c9fcf9ac3c96f8b5282bb6e16e9a392f5b208ff72a72777d30
font_01_sfnt_off00008719.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8719 2820 bytes
SHA-256: 96a70491b0783ad8c6fc9b11a18f021aa22c69ac41ee4499b781d16a1b99b689
font_02_sfnt_off000090b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x90B5 5696 bytes
SHA-256: 450e3ee45915afe13702bf1d587eb8b9ad88a8d2113419ac9f2fd116a828e139
font_03_sfnt_off00009dc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9DC6 18664 bytes
SHA-256: 0febd310f3272e9260df0b847dcd5e64ae977ef27512f671442c211964f9f781

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