Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb793e22b9fa0ccd…

MALICIOUS

PDF

34.7 KB Created: 2021-07-05 16:10:11 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 70e78aebdeec37f67f26bb2bf1fd6e6c SHA-1: 1151352bec9e5c3f1c946e24caed22c84aa2b066 SHA-256: fb793e22b9fa0ccd2ab36de8181e69cb44688600c88c603684d31cc7d6edca90
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 0.9980

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 http://netcdn.tw/app/431946152/roblox-free-robux-game-hack PDF link annotation
    • http://www.marvelorlubricants.com/uploaded_files/userfiles/files/coin-master-daily-free-spins-and-coins-link_GM406889139.pdfIn PDF document text
    • http://www.marvelorlubricants.com/uploaded_files/userfiles/files/free-spin-generator-for-coin-master_GM406889139.pdfIn PDF document text
    • http://www.marvelorlubricants.com/uploaded_files/userfiles/files/coin-master-free-coins-2021_GM406889139.pdfIn PDF document text
    • http://www.marvelorlubricants.com/uploaded_files/userfiles/files/how-to-get-minecraft-for-free-on-your-phone_GM479516143.pdfIn PDF document text
    • http://www.marvelorlubricants.com/uploaded_files/userfiles/files/coin-master-daily-free-spins-and-coins-2021_GM406889139.pdfIn PDF document text
    • http://www.marvelorlubricants.com/uploaded_files/userfiles/files/how-to-hack-a-person-on-roblox-2021_GM431946152.pdfIn PDF document text
    • http://www.marvelorlubricants.com/uploaded_files/userfiles/files/how-to-get-free-robux-in-the-game_GM431946152.pdfIn PDF document text
    • http://www.marvelorlubricants.com/uploaded_files/userfiles/files/free-robux-generator-no-human-verification_GM431946152.pdfIn PDF document text
    • http://www.marvelorlubricants.com/uploaded_files/userfiles/files/coin-master-free-spins-link-today-new-2021_GM406889139.pdfIn PDF document text
    • http://www.marvelorlubricants.com/uploaded_files/userfiles/files/games-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://www.marvelorlubricants.com/uploaded_files/userfiles/files/how-to-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://www.marvelorlubricants.com/uploaded_files/userfiles/files/minecraft_GM479516143.pdfIn PDF document text
    • http://www.marvelorlubricants.com/uploaded_files/userfiles/files/cool-roblox-outfits-free_GM431946152.pdfIn PDF document text
    • http://www.marvelorlubricants.com/uploaded_files/userfiles/files/coin-master-ultra-attack-hack_GM406889139.pdfIn PDF document text
    • http://www.marvelorlubricants.com/uploaded_files/userfiles/files/free-no-card-roblox-card_GM431946152.pdfIn PDF document text
    • http://www.marvelorlubricants.com/uploaded_files/userfiles/files/coin-master-free-cards-hack_GM406889139.pdfIn PDF document text
    • http://www.marvelorlubricants.com/uploaded_files/userfiles/files/best-free-roblox-executor_GM431946152.pdfIn PDF document text
    • http://www.marvelorlubricants.com/uploaded_files/userfiles/files/noob-vs-pro-vs-hacker-vs-god-roblox_GM431946152.pdfIn PDF document text
    • http://www.marvelorlubricants.com/uploaded_files/userfiles/files/roblox-tradelands-cheat_GM431946152.pdfIn PDF document text
    • http://www.marvelorlubricants.com/uploaded_files/userfiles/files/cheat-roblox-jailbreak_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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00003177.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3177 22392 bytes
SHA-256: 62629687252f267d5e24bf9c08f43b4357b0bb6a3a31ec3a8a90d09ae73f485a
font_01_sfnt_off00006368.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6368 18788 bytes
SHA-256: 240f26960413d3375b32b54d3a16c3eb3bd7324ec8649811f17e0fe1da2802cb

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