Malicious PDF — malware analysis report

Static analysis result for SHA-256 553f691a447bdd69…

MALICIOUS

PDF

47.1 KB Created: 2021-06-03 05:00:21 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 10b073428d2ed972aa4d2739d6fad359 SHA-1: fda1e6afd2a3fcfd548de5a7fc411edc525f2b0e SHA-256: 553f691a447bdd69a12eb0c00880778e1e2b852674faf5f9d0379e32b8356029
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple heuristics indicating malicious redirector links, specifically pointing to a lure for free game hacks or generators. The embedded URL leads to a known malicious redirector infrastructure. While no scripts were extracted, the document body and heuristics strongly suggest a phishing or scam attempt designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9769

Heuristics 4

  • 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.
  • 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.online/app/479516143/free-24-7-minecraft-server-game-hack In PDF document text
    • https://www.andrology.co.uk/uploads/files/files/get-free-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • https://www.andrology.co.uk/uploads/files/files/free-robux-group-payouts_GM431946152.pdfIn PDF document text
    • https://www.andrology.co.uk/uploads/files/files/free-robux-no-human-verification-or-survey-2021_GM431946152.pdfIn PDF document text
    • https://www.andrology.co.uk/uploads/files/files/free-coin-master-spins-links-2021_GM406889139.pdfIn PDF document text
    • https://www.andrology.co.uk/uploads/files/files/coin-master-free-spin-and-coin-links_GM406889139.pdfIn PDF document text
    • https://www.andrology.co.uk/uploads/files/files/free-robux-place_GM431946152.pdfIn PDF document text
    • https://www.andrology.co.uk/uploads/files/files/free-robux-hack_GM431946152.pdfIn PDF document text
    • https://www.andrology.co.uk/uploads/files/files/minecraft-classic-free_GM479516143.pdfIn PDF document text
    • https://www.andrology.co.uk/uploads/files/files/how-to-get-free-spins-on-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://www.andrology.co.uk/uploads/files/files/coin-master-free-spins-link-without-human-verification_GM406889139.pdfIn PDF document text
    • https://www.andrology.co.uk/uploads/files/files/free-robux-without-human-verification_GM431946152.pdfIn PDF document text
    • https://www.andrology.co.uk/uploads/files/files/ways-to-get-robux_GM431946152.pdfIn PDF document text
    • https://www.andrology.co.uk/uploads/files/files/free-robux-offers_GM431946152.pdfIn PDF document text
    • https://www.andrology.co.uk/uploads/files/files/free-spins-coin-master-links-2021_GM406889139.pdfIn PDF document text
    • https://www.andrology.co.uk/uploads/files/files/free-robux-2021-no-human-verification_GM431946152.pdfIn PDF document text
    • https://www.andrology.co.uk/uploads/files/files/free-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://www.andrology.co.uk/uploads/files/files/free-robux-generator-no-survey_GM431946152.pdfIn PDF document text
    • https://www.andrology.co.uk/uploads/files/files/master-coin-free-spin-daily_GM406889139.pdfIn PDF document text
    • https://www.andrology.co.uk/uploads/files/files/rewardex-robux_GM431946152.pdfIn PDF document text
    • https://www.andrology.co.uk/uploads/files/files/games-on-roblox-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000052ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x52EE 24876 bytes
SHA-256: 61ceb1166d963a1face8d6b66fee533af032d4caf0bfc2af0b5f8c4d4554a2e5
font_01_sfnt_off00008bf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8BF2 2956 bytes
SHA-256: 4d99fefdb5c87223aba017750cde9a9f0fb8db96ff0261282a7490a7d96f9200
font_02_sfnt_off00009625.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9625 17924 bytes
SHA-256: 6d441e79e96f2496e7d363a8fd4eac2c27151cb1acb88a4e303d16644f1cdf17

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