Malicious PDF — malware analysis report

Static analysis result for SHA-256 74991a17b4a1922b…

MALICIOUS

PDF

45.8 KB Created: 2021-05-17 05:14:10 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: f8b5d1d6901e4519d5dea090d2eb219b SHA-1: 949c6c76550bfd13181402309ae855076892f0aa SHA-256: 74991a17b4a1922b4ca121a4deb251e3b20e90b1c01131687a79b6b32417e1b7
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 0.9432

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.xyz/app/406889139/haktuts-coin-master-free-spin-today-game-hack PDF link annotation
    • http://subarulegacy.com/images/hack-coin-master-without-verification_GM406889139.pdfIn PDF document text
    • http://subarulegacy.com/images/free-robux-generator-2021_GM431946152.pdfIn PDF document text
    • http://subarulegacy.com/images/free-promo-codes-roblox_GM431946152.pdfIn PDF document text
    • http://subarulegacy.com/images/how-do-you-get-free-robux_GM431946152.pdfIn PDF document text
    • http://subarulegacy.com/images/free-minecraft-accounts-2021_GM479516143.pdfIn PDF document text
    • http://subarulegacy.com/images/free-links-to-coin-master_GM406889139.pdfIn PDF document text
    • http://subarulegacy.com/images/free-spins-coin-master-app_GM406889139.pdfIn PDF document text
    • http://subarulegacy.com/images/free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://subarulegacy.com/images/coin-master-online-hack-download_GM406889139.pdfIn PDF document text
    • http://subarulegacy.com/images/coin-master-hack-mod-apk_GM406889139.pdfIn PDF document text
    • http://subarulegacy.com/images/how-to-hack-coin-master_GM406889139.pdfIn PDF document text
    • http://subarulegacy.com/images/a-lot-of-robux_GM431946152.pdfIn PDF document text
    • http://subarulegacy.com/images/coin-master-attack-block-hack_GM406889139.pdfIn PDF document text
    • http://subarulegacy.com/images/coin-master-free-spins-hacktman_GM406889139.pdfIn PDF document text
    • http://subarulegacy.com/images/hack-coin-master-app-ios_GM406889139.pdfIn PDF document text
    • http://subarulegacy.com/images/coin-master-cheats-free-spins_GM406889139.pdfIn PDF document text
    • http://subarulegacy.com/images/rbxfree-com-free-robux_GM431946152.pdfIn PDF document text
    • http://subarulegacy.com/images/roblox-play-as-guest-free_GM431946152.pdfIn PDF document text
    • http://subarulegacy.com/images/fake-robux-codes_GM431946152.pdfIn PDF document text
    • http://subarulegacy.com/images/free-robux-co_GM431946152.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_003_off00004815.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4815 27152 bytes
SHA-256: 5b572026eceaed57b25b3a1274f45915d7e8fb3ef6f08efa617c524fd113f846
font_01_sfnt_off00008610.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8610 2812 bytes
SHA-256: fc92a80cefddbcc51cb4ecd7284aa73b746cbd66adcf1d96110f0323ec06b51f
font_02_sfnt_off00008fb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8FB1 18548 bytes
SHA-256: ff29dc36ee836ec27aa4b8c67db5cb92c4140edc8b4c21c52ca42a759f788c2c

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