Malicious PDF — malware analysis report

Static analysis result for SHA-256 09c394a65c1b4e1b…

MALICIOUS

PDF

34.5 KB Created: 2021-07-03 14:24:45 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 0b50829a89d0843fbaa4a1fd91a94571 SHA-1: 24d5db2e330b075dbb619db586097143fdc8cc8f SHA-256: 09c394a65c1b4e1b5cbefa6bfba1eaec11bf06f37b9f1c511bc3ffa6f2cc5efa
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to websites that offer game hacks and generators, such as 'free tiktok coins' and 'robux hacks'. One of these links, http://netcdn.tw/app/835599320/free-tiktok-coins-game-hack, is identified as a malicious redirector. The document body and embedded links suggest a lure to trick users into visiting potentially malicious sites, likely as part of a phishing or malware distribution campaign.

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/835599320/free-tiktok-coins-game-hack In PDF document text
    • https://www.knjizara-harfa.rs/files/roblox-cheat-codes-from-nitro-fun_GM431946152.pdfIn PDF document text
    • https://www.knjizara-harfa.rs/files/free-audio-upload-for-roblox_GM431946152.pdfIn PDF document text
    • https://www.knjizara-harfa.rs/files/get-robux-today_GM431946152.pdfIn PDF document text
    • https://www.knjizara-harfa.rs/files/gamehackbiz-roblox_GM431946152.pdfIn PDF document text
    • https://www.knjizara-harfa.rs/files/how-to-get-free-tiktok-followers-without-downloading-apps_GM835599320.pdfIn PDF document text
    • https://www.knjizara-harfa.rs/files/coin-master-free-spins-and-coins-today-gift-reward_GM406889139.pdfIn PDF document text
    • https://www.knjizara-harfa.rs/files/how-to-hack-coin-master_GM406889139.pdfIn PDF document text
    • https://www.knjizara-harfa.rs/files/free-robux-with-no-downloads_GM431946152.pdfIn PDF document text
    • https://www.knjizara-harfa.rs/files/appbounty-robux-hack-without-human-verification_GM431946152.pdfIn PDF document text
    • https://www.knjizara-harfa.rs/files/free-modded-minecraft-server-hosting_GM479516143.pdfIn PDF document text
    • https://www.knjizara-harfa.rs/files/cheats-for-roblox-2021_GM431946152.pdfIn PDF document text
    • https://www.knjizara-harfa.rs/files/roblox-wiki-free-robux_GM431946152.pdfIn PDF document text
    • https://www.knjizara-harfa.rs/files/este-pagina-hack-te-regala-muchos-robux-en-roblox-funcionando_GM431946152.pdfIn PDF document text
    • https://www.knjizara-harfa.rs/files/7-year-old-roblox_GM431946152.pdfIn PDF document text
    • https://www.knjizara-harfa.rs/files/free-roblox-shirt-designs_GM431946152.pdfIn PDF document text
    • https://www.knjizara-harfa.rs/files/roblox-land-free-robux_GM431946152.pdfIn PDF document text
    • https://www.knjizara-harfa.rs/files/coin-master-hack-spins_GM406889139.pdfIn PDF document text
    • https://www.knjizara-harfa.rs/files/get-free-robux-by-number_GM431946152.pdfIn PDF document text
    • https://www.knjizara-harfa.rs/files/free-robux-form-hectic-plays_GM431946152.pdfIn PDF document text
    • https://www.knjizara-harfa.rs/files/deluxe-ninja-sword-for-roblox-for-free_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_off000033ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x33CE 22252 bytes
SHA-256: 064ede48b8ff1a804956c136cdef3949271aa7d6f086a0b5eb48c81a54733e42
font_01_sfnt_off000064f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x64F2 17972 bytes
SHA-256: fcfbb39a4b44212e2e83dd056e0e3d1a7bdbc0b6b7e3536e733aaa92041c090a

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