Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a4c719b8bc2edb4…

MALICIOUS

PDF

34.3 KB Created: 2021-07-05 19:20:25 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 102333bd728a6ce5a103a559615cadc8 SHA-1: 06107598d3f6e33e2a79c8fded803524bba978c6 SHA-256: 0a4c719b8bc2edb4492c966c49602329cf5e160f1ba586a43fe77b00eb9d1474
160 Risk Score

Malware Insights

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

The PDF document contains links that redirect to malicious infrastructure, specifically advertising free in-game currency generators. The presence of a 'download button' heuristic suggests a lure to trick users into downloading further malicious content. Although no scripts were explicitly extracted, the PDF structure and embedded URLs strongly indicate a phishing or social engineering attack aimed at users interested in online games.

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/431946152/free-robux-link-game-hack In PDF document text
    • https://www.brightwake.co.uk/uploads/files/files/websites-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • https://www.brightwake.co.uk/uploads/files/files/free-coin-master-game_GM406889139.pdfIn PDF document text
    • https://www.brightwake.co.uk/uploads/files/files/minecraft-packs-free_GM479516143.pdfIn PDF document text
    • https://www.brightwake.co.uk/uploads/files/files/mc-hacks_GM479516143.pdfIn PDF document text
    • https://www.brightwake.co.uk/uploads/files/files/roblox-apocalypse-rising-shenanigans-mod-cheat-code_GM431946152.pdfIn PDF document text
    • https://www.brightwake.co.uk/uploads/files/files/how-to-hack-in-roblox-2021-fly_GM431946152.pdfIn PDF document text
    • https://www.brightwake.co.uk/uploads/files/files/free-lua-roblox-exploit_GM431946152.pdfIn PDF document text
    • https://www.brightwake.co.uk/uploads/files/files/cach-co-do-free-trong-roblox_GM431946152.pdfIn PDF document text
    • https://www.brightwake.co.uk/uploads/files/files/robux-hack-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • https://www.brightwake.co.uk/uploads/files/files/teach-me-how-to-hack-roblox-accounts_GM431946152.pdfIn PDF document text
    • https://www.brightwake.co.uk/uploads/files/files/free-robux-roblox-promo-codes_GM431946152.pdfIn PDF document text
    • https://www.brightwake.co.uk/uploads/files/files/free-robux-using-cheat-engine_GM431946152.pdfIn PDF document text
    • https://www.brightwake.co.uk/uploads/files/files/roblox-my-girlfriend-cheated-on-me_GM431946152.pdfIn PDF document text
    • https://www.brightwake.co.uk/uploads/files/files/how-to-create-group-in-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • https://www.brightwake.co.uk/uploads/files/files/hacks-for-jailbreak-roblox_GM431946152.pdfIn PDF document text
    • https://www.brightwake.co.uk/uploads/files/files/robux-games_GM431946152.pdfIn PDF document text
    • https://www.brightwake.co.uk/uploads/files/files/coin-master-free-spin-today_GM406889139.pdfIn PDF document text
    • https://www.brightwake.co.uk/uploads/files/files/coin-master-free-spins-link-deutsch-ios_GM406889139.pdfIn PDF document text
    • https://www.brightwake.co.uk/uploads/files/files/free-robux-202120210-woking-feb-2021_GM431946152.pdfIn PDF document text
    • https://www.brightwake.co.uk/uploads/files/files/best-minecraft-hacked-client_GM479516143.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_off00003027.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3027 22068 bytes
SHA-256: 1d287baec5f07df089735df56eded4b08c6335a3555f3c923f7d7850b3e98182
font_01_sfnt_off0000610a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x610A 19008 bytes
SHA-256: a11a737a93c2cddb47bbb5a91c346e1b782ee8df03973ee462993f1f8904f3c0