Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8f056e536992f14…

MALICIOUS

PDF

41.1 KB Created: 2021-05-19 07:47:40 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 8a4f6e4d40a8a0bc149fead5c710eda5 SHA-1: 8c6aa81706c449109d1da67cda8995fb50113a36 SHA-256: a8f056e536992f14821e2e752065ac0a0e81b4257723e4d6036e86c6e128882a
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a large number of external links, many of which are SEO-optimized and point to other PDF files, suggesting a link farm designed to attract users searching for game cheats or hacks. The presence of a "download button" heuristic and the ML classifier's high confidence score indicate malicious intent. The document body, though heavily obfuscated, contains URLs that are likely part of this lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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.xyz/app/406889139/haktuts-coin-master-hack-game-hack PDF link annotation
    • http://huananhai.net/images/free-robux-com-real_GM431946152.pdfIn PDF document text
    • http://huananhai.net/images/coin-master-hack-android-root_GM406889139.pdfIn PDF document text
    • http://huananhai.net/images/bloxpink-free-robux_GM431946152.pdfIn PDF document text
    • http://huananhai.net/images/haktuts-coin-master-free-spins-2021_GM406889139.pdfIn PDF document text
    • http://huananhai.net/images/coin-master-free-coins-and-spins-daily-summary_GM406889139.pdfIn PDF document text
    • http://huananhai.net/images/how-to-get-minecraft-bedrock-edition-on-pc-for-free_GM479516143.pdfIn PDF document text
    • http://huananhai.net/images/how-to-get-free-robux-on-roblox-2021_GM431946152.pdfIn PDF document text
    • http://huananhai.net/images/coin-master-free-spins-daily-link-game-mod_GM406889139.pdfIn PDF document text
    • http://huananhai.net/images/coin-master-free-spins-link-blogspot_GM406889139.pdfIn PDF document text
    • http://huananhai.net/images/coin-master-spin-link-today-2021_GM406889139.pdfIn PDF document text
    • http://huananhai.net/images/free-spins-for-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://huananhai.net/images/roblox-com-r_GM431946152.pdfIn PDF document text
    • http://huananhai.net/images/coin-master-spin-hack-pc_GM406889139.pdfIn PDF document text
    • http://huananhai.net/images/how-to-get-free-robux-without-downloading-any-apps_GM431946152.pdfIn PDF document text
    • http://huananhai.net/images/coin-master-hack-fast-org_GM406889139.pdfIn PDF document text
    • http://huananhai.net/images/como-hackear-juego-coin-master_GM406889139.pdfIn PDF document text
    • http://huananhai.net/images/minecraft-pe-hacks-2021_GM479516143.pdfIn PDF document text
    • http://huananhai.net/images/free-coins-coin-master_GM406889139.pdfIn PDF document text
    • http://huananhai.net/images/free-robux-app-2021_GM431946152.pdfIn PDF document text
    • http://huananhai.net/images/minecraft-diamond-finder-hack_GM479516143.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004791.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4791 25132 bytes
SHA-256: e09f0b1f38d73c2fb698e1e379b5c4d7af82a10478f57b16af9984f987faeb38
font_01_sfnt_off00007f83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7F83 17856 bytes
SHA-256: 9d532db5ca49de3fb30c806d155421febeb55a7b3dfa841ae7df44a022e8d237

Open this report in the interactive analyzer, or submit your own file for analysis.