Malicious PDF — malware analysis report

Static analysis result for SHA-256 167a85a5398d4e50…

MALICIOUS

PDF

49.6 KB Created: 2021-06-11 09:38:30 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 8e8b882088825a34ba14d9ea0f183985 SHA-1: 79d7c23d239233e02cbb314b71dd749bc5467ec9 SHA-256: 167a85a5398d4e505ff74700b196bee65f8375a825c3053fe15b8dd5a11c37c8
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a large number of external links, identified as a PDF link farm. The primary URL points to a page related to hacking Roblox, suggesting a lure for users interested in such topics. While no scripts were directly extracted, the PDF structure and numerous embedded links indicate a malicious intent to redirect users to potentially harmful content or further stages of an attack. The ML classifier strongly supports the malicious verdict.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9796

Heuristics 4

  • 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
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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.tw/app/431946152/can-you-only-hack-roblox-once-game-hack PDF link annotation
    • http://aviaprofsoyuz.info/images/grab-points-login_GM431946152.pdfIn PDF document text
    • http://aviaprofsoyuz.info/images/how-to-get-free-robux-for-free_GM431946152.pdfIn PDF document text
    • http://aviaprofsoyuz.info/images/youtube-roblox-broken-bones-cheat_GM431946152.pdfIn PDF document text
    • http://aviaprofsoyuz.info/images/free-minecraft-skins-java_GM479516143.pdfIn PDF document text
    • http://aviaprofsoyuz.info/images/free-robux-games-that-actually-work-2021_GM431946152.pdfIn PDF document text
    • http://aviaprofsoyuz.info/images/how-to-get-free-robux-2021-no-human-verification_GM431946152.pdfIn PDF document text
    • http://aviaprofsoyuz.info/images/how-to-hack-coin-master-with-game-guardian_GM406889139.pdfIn PDF document text
    • http://aviaprofsoyuz.info/images/free-hacks-for-coin-master_GM406889139.pdfIn PDF document text
    • http://aviaprofsoyuz.info/images/star-roblox-mad-city-hack_GM431946152.pdfIn PDF document text
    • http://aviaprofsoyuz.info/images/free-robux-no-hacks-or-inspect_GM431946152.pdfIn PDF document text
    • http://aviaprofsoyuz.info/images/coin-master-hack-online-2021_GM406889139.pdfIn PDF document text
    • http://aviaprofsoyuz.info/images/download-coin-master-hack-tool-v1-9_GM406889139.pdfIn PDF document text
    • http://aviaprofsoyuz.info/images/coin-master-pet-food-free_GM406889139.pdfIn PDF document text
    • http://aviaprofsoyuz.info/images/minecraft-hacks-ps4_GM479516143.pdfIn PDF document text
    • http://aviaprofsoyuz.info/images/free-coin-link-for-coin-master_GM406889139.pdfIn PDF document text
    • http://aviaprofsoyuz.info/images/bloxpage-free-robux_GM431946152.pdfIn PDF document text
    • http://aviaprofsoyuz.info/images/can-i-download-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://aviaprofsoyuz.info/images/minecraft-hack-client-18-9_GM479516143.pdfIn PDF document text
    • http://aviaprofsoyuz.info/images/ultimate-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://aviaprofsoyuz.info/images/how-to-coin-master-spin-hack_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00004fb7.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4FB7 28452 bytes
SHA-256: 2cf1cb697ebe16ef41ac6411dfc21619cfbc7d57b08fd550c61aa7b5b2267c9f
font_01_sfnt_off000090c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x90C6 5696 bytes
SHA-256: 450e3ee45915afe13702bf1d587eb8b9ad88a8d2113419ac9f2fd116a828e139
font_02_sfnt_off00009dd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9DD7 18664 bytes
SHA-256: c6725eb977dd17ab47dd3295ea02609a84277ff480adce2ac681f052ba11d86b

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