Malicious PDF — malware analysis report

Static analysis result for SHA-256 df56a80366468666…

MALICIOUS

PDF

45.7 KB Created: 2021-06-03 05:09:33 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 9f8b6c2fb4641d2cd5da3fe1747e9165 SHA-1: 67795f9eada66cd4f77d6808e2d72f063cfb292e SHA-256: df56a80366468666bf99aa74ffeac8132f16f6cea1a9ffc706b1ef069a57b954
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9797

Heuristics 5

  • 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.
  • PDF links to a 'free generator / game hack' redirector high 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.
  • 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.online/app/406889139/coin-master-free-spins-link-today-instagram-game-hack PDF link annotation
    • http://ratchadatitan.com/UserFiles/File/coin-master-hack-2021-link_GM406889139.pdfIn PDF document text
    • http://ratchadatitan.com/UserFiles/File/coin-master-free-spins-link-no-verification_GM406889139.pdfIn PDF document text
    • http://ratchadatitan.com/UserFiles/File/coin-master-free-coins-and-spins-app_GM406889139.pdfIn PDF document text
    • http://ratchadatitan.com/UserFiles/File/hack-coin-master-site-rssingcom_GM406889139.pdfIn PDF document text
    • http://ratchadatitan.com/UserFiles/File/roblox-games-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • http://ratchadatitan.com/UserFiles/File/coin-master-free-spins-and-coins-without-human-verification_GM406889139.pdfIn PDF document text
    • http://ratchadatitan.com/UserFiles/File/how-to-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://ratchadatitan.com/UserFiles/File/coin-master-apk-mod-free-download_GM406889139.pdfIn PDF document text
    • http://ratchadatitan.com/UserFiles/File/coin-master-free-spins-hack-apk-download_GM406889139.pdfIn PDF document text
    • http://ratchadatitan.com/UserFiles/File/free-coin-master-coins-and-spins_GM406889139.pdfIn PDF document text
    • http://ratchadatitan.com/UserFiles/File/how-to-get-free-robux-com_GM431946152.pdfIn PDF document text
    • http://ratchadatitan.com/UserFiles/File/pokemon-go-free-9db_GM1094591345.pdfIn PDF document text
    • http://ratchadatitan.com/UserFiles/File/free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://ratchadatitan.com/UserFiles/File/coin-master-free-link_GM406889139.pdfIn PDF document text
    • http://ratchadatitan.com/UserFiles/File/free-spin-links-coin-master-october-30-2021_GM406889139.pdfIn PDF document text
    • http://ratchadatitan.com/UserFiles/File/how-do-you-get-free-robux-without-paying_GM431946152.pdfIn PDF document text
    • http://ratchadatitan.com/UserFiles/File/roblox-hack_GM431946152.pdfIn PDF document text
    • http://ratchadatitan.com/UserFiles/File/minecraft-windows-10-edition-hacks_GM479516143.pdfIn PDF document text
    • http://ratchadatitan.com/UserFiles/File/minecraft-free-exe_GM479516143.pdfIn PDF document text
    • http://ratchadatitan.com/UserFiles/File/minecraft-building-hacks_GM479516143.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00004e65.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4E65 23916 bytes
SHA-256: b440d7ef84fa2eb624ef45de624910ebcbd7627a616e297e70ef712ef87bfd08
font_01_sfnt_off00008427.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8427 2824 bytes
SHA-256: 381f6d859be141449dd645f7be1484d2a1cf49218dc471b402dae69eaa2b11d5
font_02_sfnt_off00008dc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8DC9 18960 bytes
SHA-256: c3cae131f36bdfe9c813bd150295f39ca0ceeabf3546a2df254cc03f93d9c6e3

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