Malicious PDF — malware analysis report

Static analysis result for SHA-256 41f2a17a2ca4538a…

MALICIOUS

PDF

41.6 KB Created: 2021-05-16 17:15:38 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 8b9960640d76058eca9eba1f3ad1a764 SHA-1: 94ce4b1a40b60c85fa770096f30963132016cbfb SHA-256: 41f2a17a2ca4538ad7687388753360d6c24177c04f0c1b58a0ebb083941b0cd5
142 Risk Score

Malware Insights

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

The PDF contains multiple links to external websites, including one that appears to be a redirector for game hacks and another that hosts a large collection of SEO-optimized PDF files. This suggests a link farm or traffic distribution scheme designed to lure users to potentially malicious content. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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/431946152/google-roblox-games-game-hack PDF link annotation
    • https://ourlady-elearning.com/userfiles/files/coin-master-game-hack-kaise-kare_GM406889139.pdfIn PDF document text
    • https://ourlady-elearning.com/userfiles/files/coin-master-daily-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • https://ourlady-elearning.com/userfiles/files/free-coin-and-spin-in-coin-master_GM406889139.pdfIn PDF document text
    • https://ourlady-elearning.com/userfiles/files/oginject-co_GM406889139.pdfIn PDF document text
    • https://ourlady-elearning.com/userfiles/files/free-robux-no-human-verification-and-no-survey_GM431946152.pdfIn PDF document text
    • https://ourlady-elearning.com/userfiles/files/free-coins--spins-coin-master_GM406889139.pdfIn PDF document text
    • https://ourlady-elearning.com/userfiles/files/getrobux-ninja_GM431946152.pdfIn PDF document text
    • https://ourlady-elearning.com/userfiles/files/roblox-free-robux-hack_GM431946152.pdfIn PDF document text
    • https://ourlady-elearning.com/userfiles/files/get-free-cards-in-coin-master_GM406889139.pdfIn PDF document text
    • https://ourlady-elearning.com/userfiles/files/coin-master-free-download-pc_GM406889139.pdfIn PDF document text
    • https://ourlady-elearning.com/userfiles/files/free-spin-sites-for-coin-master_GM406889139.pdfIn PDF document text
    • https://ourlady-elearning.com/userfiles/files/coin-master-time-speed-hack_GM406889139.pdfIn PDF document text
    • https://ourlady-elearning.com/userfiles/files/coin-master-unlimited-spin-hack_GM406889139.pdfIn PDF document text
    • https://ourlady-elearning.com/userfiles/files/master-coin-hack-app_GM406889139.pdfIn PDF document text
    • https://ourlady-elearning.com/userfiles/files/coin-master-download_GM406889139.pdfIn PDF document text
    • https://ourlady-elearning.com/userfiles/files/how-to-get-free-shirts-on-roblox_GM431946152.pdfIn PDF document text
    • https://ourlady-elearning.com/userfiles/files/roblox-promo-code-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://ourlady-elearning.com/userfiles/files/how-to-get-minecraft-coins-for-free_GM479516143.pdfIn PDF document text
    • https://ourlady-elearning.com/userfiles/files/hack-crack-for-coin-master-currency_GM406889139.pdfIn PDF document text
    • https://ourlady-elearning.com/userfiles/files/free-spin-link-of-coin-master_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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off000047bd.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x47BD 24376 bytes
SHA-256: b102d796a4e8eb09240bc53cb25850e9e69e0c069beebce96b05a6e08e8dfef1
font_01_sfnt_off00007f4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7F4D 18560 bytes
SHA-256: 0fb1d19a9ce31739a953e5696a177f7c2cbb3bd8fcc5147d812294bb20adc511

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