Malicious PDF — malware analysis report

Static analysis result for SHA-256 0efea9aaa6a4c563…

MALICIOUS

PDF

33.7 KB Created: 2021-07-06 05:25:33 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-11
MD5: f1348b8057a4065c23eeffe0d8da3d2b SHA-1: 0f78b52de5a4a45db49813c292d3c26f18821986 SHA-256: 0efea9aaa6a4c563017cf801a40c2adcfcc7f2f9e3af4e85ee56d2b1b79e54e5
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links designed to lure users into clicking on what appear to be game hacks or generators. Several heuristics indicate these links lead to malicious redirectors and a link farm, suggesting a phishing or scam campaign. The document body itself contains obfuscated text and URLs, reinforcing the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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.
  • 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.
  • 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 http://netcdn.tw/app/431946152/blox-rewards-game-hack In PDF document text
    • http://perpus.masda.ac.id/repository/free-hacks-for-coin-master_GM406889139.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/roblox-free-robux-code-2021_GM431946152.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/hack-to-not-die-in-roblox_GM431946152.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/how-to-get-free-robux-cards-200k_GM431946152.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/apps-that-get-you-free-robux_GM431946152.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/hack-roblox-volar_GM431946152.pdfIn PDF document text
    • http://perpus.masda.ac.id//repository/try-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/coin-master-hack-no-survey-or-verification_GM406889139.pdfIn PDF document text
    • http://perpus.masda.ac.id//repository/how-to-hack-coin-master-apkmody_GM406889139.pdfIn PDF document text
    • http://perpus.masda.ac.id//repository/how-to-get-free-robux-generator_GM431946152.pdfIn PDF document text
    • http://perpus.masda.ac.id//repository/real-free-robux-codes_GM431946152.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/roblox-hack-no-human-verification-2021-pc_GM431946152.pdfIn PDF document text
    • http://perpus.masda.ac.id//repository/minecraft-windows-10-free-with-java_GM479516143.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/free-onligames-like-roblox_GM431946152.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/tears-roblox-hack_GM431946152.pdfIn PDF document text
    • http://perpus.masda.ac.id//repository/is-pubg-uc-worth-it_GM1330123889.pdfIn PDF document text
    • http://perpus.masda.ac.id//repository/how-to-get-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/tiktok-editor-free-download_GM835599320.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/coin-master-free-gift-links-2021_GM406889139.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/roblox-fnaf-rp-how-to-get-free-via_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_off00002e8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2E8A 22032 bytes
SHA-256: 3496ea27bc5d399256ca6476e01969612520065f77d7dfa8db0b2dd732274a13
font_01_sfnt_off00005f65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5F65 18668 bytes
SHA-256: aea007d4b888db5e44469e4a0733284c9a6c01fa70c17fdadd219b1cdd024207

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