Malicious PDF — malware analysis report

Static analysis result for SHA-256 31353d2b39590ae3…

MALICIOUS

PDF

50.8 KB Created: 2021-05-14 09:12:24 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 0a292b7715ae90a4942719040c7d98c4 SHA-1: 14dc8c6c990dbf20fbe22e3b77bbf4ae42695a4b SHA-256: 31353d2b39590ae3fa11a645a022b7fcc49b14689f29fe2cf40dde01b1632a2b
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links designed to lure users into clicking on them by promising free game currency or hacks. These links redirect to malicious infrastructure, specifically the URL https://netcdn.xyz/app/431946152/free-robux-real-working-game-hack, which is flagged as a malicious redirector. The document body and embedded URLs strongly suggest a phishing or scam attempt to trick users into visiting potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

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.xyz/app/431946152/free-robux-real-working-game-hack In PDF document text
    • https://www.e-starmagazine.com/uploads/files/coin-master-free-spins-11-01-2021_GM406889139.pdfIn PDF document text
    • https://www.e-starmagazine.com/uploads/files/mathep_GM431946152.pdfIn PDF document text
    • https://www.e-starmagazine.com/uploads/files/minecraft-bedrock-free-server-hosting_GM479516143.pdfIn PDF document text
    • https://www.e-starmagazine.com/uploads/files/minecraft-bedrock-hacks-windows-10_GM479516143.pdfIn PDF document text
    • https://www.e-starmagazine.com/uploads/files/synapse-roblox-free-download_GM431946152.pdfIn PDF document text
    • https://www.e-starmagazine.com/uploads/files/how-to-get-free-robux-without-verification_GM431946152.pdfIn PDF document text
    • https://www.e-starmagazine.com/uploads/files/coin-master-free-cards-link_GM406889139.pdfIn PDF document text
    • https://www.e-starmagazine.com/uploads/files/websites-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://www.e-starmagazine.com/uploads/files/robux-hack-2021_GM431946152.pdfIn PDF document text
    • https://www.e-starmagazine.com/uploads/files/what-is-robux-in-roblox_GM431946152.pdfIn PDF document text
    • https://www.e-starmagazine.com/uploads/files/kuso-icu-roblox-hack_GM431946152.pdfIn PDF document text
    • https://www.e-starmagazine.com/uploads/files/hack-version-of-coin-master_GM406889139.pdfIn PDF document text
    • https://www.e-starmagazine.com/uploads/files/free-premium-roblox_GM431946152.pdfIn PDF document text
    • https://www.e-starmagazine.com/uploads/files/how-to-get-to-village-3-in-coin-master_GM406889139.pdfIn PDF document text
    • https://www.e-starmagazine.com/uploads/files/coin-master-free-coins-link-2021_GM406889139.pdfIn PDF document text
    • https://www.e-starmagazine.com/uploads/files/free-coin-master-cheats_GM406889139.pdfIn PDF document text
    • https://www.e-starmagazine.com/uploads/files/free-minecraft-client_GM479516143.pdfIn PDF document text
    • https://www.e-starmagazine.com/uploads/files/coin-master-hack-without-human-verification_GM406889139.pdfIn PDF document text
    • https://www.e-starmagazine.com/uploads/files/coin-master-hack-apk-download_GM406889139.pdfIn PDF document text
    • https://www.e-starmagazine.com/uploads/files/coin-master-deals_GM406889139.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_off00005008.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5008 36492 bytes
SHA-256: a8869dd90e8f90042f8406c6f551e158a36623f9363a51d1ad197cef9cef09ea
font_01_sfnt_off0000a202.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA202 19196 bytes
SHA-256: ba181001b9f47374cded172748d6918d61d0c0680c6a54c80fd076284e5245e7

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