Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d4a18a0cf1c0100…

MALICIOUS

PDF

40.6 KB Created: 2021-05-30 04:09:54 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 7aa7100d84ddadab485447ac872c9268 SHA-1: 777cddec0b4d2d50274cae8f767eff660a551202 SHA-256: 3d4a18a0cf1c01001621b403864bb7044e7d8c131b071bdc85df8383d21dc423
200 Risk Score

Malware Insights

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

This PDF document is designed as a lure, impersonating brands like Amazon to trick users into clicking links for 'free generators' or 'game hacks'. The primary link directs to a known malicious redirector infrastructure, which likely serves as a gateway to further malicious content or credential harvesting pages. The presence of multiple embedded URLs and the ML classifier's high confidence score indicate a deliberate malicious intent to exploit user interest in freebies or game cheats.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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/how-to-get-free-robux-without-verification-or-surveys-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/how-to-get-free-robux-without-verification-or-surveys-game-hack In PDF document text
    • https://brsolutions.pl/wp-content/uploads/fsqm-files/coin-master-free-spin-and-coins-links-2021_GM406889139.pdfIn PDF document text
    • https://brsolutions.pl/wp-content/uploads/fsqm-files/free-spins-and-coins-for-coin-master_GM406889139.pdfIn PDF document text
    • https://brsolutions.pl/wp-content/uploads/fsqm-files/was-minecraft-ever-free_GM479516143.pdfIn PDF document text
    • https://brsolutions.pl/wp-content/uploads/fsqm-files/tiktok-fans-free_GM835599320.pdfIn PDF document text
    • https://brsolutions.pl/wp-content/uploads/fsqm-files/coin-master-hacks_GM406889139.pdfIn PDF document text
    • https://brsolutions.pl/wp-content/uploads/fsqm-files/free-spins-and-coins-coin-master_GM406889139.pdfIn PDF document text
    • https://brsolutions.pl/wp-content/uploads/fsqm-files/coin-master-daily-free-spin-app_GM406889139.pdfIn PDF document text
    • https://brsolutions.pl/wp-content/uploads/fsqm-files/free-minecraft-alts_GM479516143.pdfIn PDF document text
    • https://brsolutions.pl/wp-content/uploads/fsqm-files/coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • https://brsolutions.pl/wp-content/uploads/fsqm-files/bux-life-free-robux_GM431946152.pdfIn PDF document text
    • https://brsolutions.pl/wp-content/uploads/fsqm-files/free-coin-master-spins-2021_GM406889139.pdfIn PDF document text
    • https://brsolutions.pl/wp-content/uploads/fsqm-files/free-robux-no-human-verification-or-survey-or-download-2021_GM431946152.pdfIn PDF document text
    • https://brsolutions.pl/wp-content/uploads/fsqm-files/free-robux-gift-card-codes_GM431946152.pdfIn PDF document text
    • https://brsolutions.pl/wp-content/uploads/fsqm-files/earn-free-robux_GM431946152.pdfIn PDF document text
    • https://brsolutions.pl/wp-content/uploads/fsqm-files/tiktok-views-free_GM835599320.pdfIn PDF document text
    • https://brsolutions.pl/wp-content/uploads/fsqm-files/free-coin-master-spins-and-coins_GM406889139.pdfIn PDF document text
    • https://brsolutions.pl/wp-content/uploads/fsqm-files/adopt-me-roblox-hacks_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
font_00_sfnt_off000040c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x40C4 24692 bytes
SHA-256: ad272c1899a42dbb80d2d82ec98fc30a72350d763f7aad652ac09f477b7a7e17
font_01_sfnt_off00007934.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7934 19424 bytes
SHA-256: 30551668946d9b3d80fdd5a427c07e5f2c52faec585ae3c44dbbbd4d67cc7463

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