Malicious PDF — malware analysis report

Static analysis result for SHA-256 931f9f94c8d8d522…

MALICIOUS

PDF

36.3 KB Created: 2021-07-03 22:42:26 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 49a29f0c2ac95a34f609ade22b0d6dc5 SHA-1: 15884b8cc07fe636575a2bcc5b4464883b53d126 SHA-256: 931f9f94c8d8d522523f6a1a33e41b117660294af5f07bb8327b1451e4bb6629
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a critical heuristic firing for a game hack redirector lure, pointing to malicious infrastructure. The document body and embedded URLs reinforce this, indicating a phishing attempt to trick users into visiting a site offering 'free generator / game hack' content. No scripts were extracted, but the primary function appears to be redirecting users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://netcdn.tw/app/406889139/coin-master-free-coins-link-2021-deutsch-game-hack In PDF document text
    • https://www.fotokad.ae/uploaded_files/userfiles/files/roblox-how-to-get-free-robux-generator_GM431946152.pdfIn PDF document text
    • https://www.fotokad.ae/uploaded_files/userfiles/files/tiktok-minecraft-hacks_GM479516143.pdfIn PDF document text
    • https://www.fotokad.ae/uploaded_files/userfiles/files/websites-for-robux_GM431946152.pdfIn PDF document text
    • https://www.fotokad.ae/uploaded_files/userfiles/files/unlockmygamescom-free-robux_GM431946152.pdfIn PDF document text
    • https://www.fotokad.ae/uploaded_files/userfiles/files/free-robux-without-offers_GM431946152.pdfIn PDF document text
    • https://www.fotokad.ae/uploaded_files/userfiles/files/free-free-robux_GM431946152.pdfIn PDF document text
    • https://www.fotokad.ae/uploaded_files/userfiles/files/coin-master-free-coins-2021_GM406889139.pdfIn PDF document text
    • https://www.fotokad.ae/uploaded_files/userfiles/files/how-to-make-free-admin-game-roblox_GM431946152.pdfIn PDF document text
    • https://www.fotokad.ae/uploaded_files/userfiles/files/roblox-death-zone-hacks_GM431946152.pdfIn PDF document text
    • https://www.fotokad.ae/uploaded_files/userfiles/files/roblox-cheat-engine-noclip-fly_GM431946152.pdfIn PDF document text
    • https://www.fotokad.ae/uploaded_files/userfiles/files/jailbreak-roblox-cheats-cage_GM431946152.pdfIn PDF document text
    • https://www.fotokad.ae/uploaded_files/userfiles/files/free-coins_GM406889139.pdfIn PDF document text
    • https://www.fotokad.ae/uploaded_files/userfiles/files/how-to-hack-roblox-account-with-cookie-editor_GM431946152.pdfIn PDF document text
    • https://www.fotokad.ae/uploaded_files/userfiles/files/wow-to-free-robux-november-2021_GM431946152.pdfIn PDF document text
    • https://www.fotokad.ae/uploaded_files/userfiles/files/free-robux-instantly_GM431946152.pdfIn PDF document text
    • https://www.fotokad.ae/uploaded_files/userfiles/files/coin-master-free-spin-2912-2021_GM406889139.pdfIn PDF document text
    • https://www.fotokad.ae/uploaded_files/userfiles/files/coin-master-el-tiger-card-free_GM406889139.pdfIn PDF document text
    • https://www.fotokad.ae/uploaded_files/userfiles/files/rbxoffers-earn-free-robux_GM431946152.pdfIn PDF document text
    • https://www.fotokad.ae/uploaded_files/userfiles/files/ban-hacks-in-roblox_GM431946152.pdfIn PDF document text
    • https://www.fotokad.ae/uploaded_files/userfiles/files/free-roblox-gfx_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_off000034fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x34FE 23152 bytes
SHA-256: 8eec2f9fff2d51a407a35c4fc195c10c05c40bd4bc45714794bc5867eb28bd90
font_01_sfnt_off000068fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x68FB 19044 bytes
SHA-256: 2844f756ddbcc4a04a8e584fba3bd9ee643c4403cf9fe90d32670bab9c0c39f1

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