Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb15f682ce77a5f8…

MALICIOUS

PDF

35.6 KB Created: 2021-07-01 01:20:08 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 3e31386803ec2abd59f94066639b9f18 SHA-1: 1f6bdedfe03bb0600460f3671d05172276469f15 SHA-256: eb15f682ce77a5f80b1265320ac201e8c029aafea466949e2b813bae70320b92
200 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document employs social engineering tactics, using lures related to popular games like Roblox to trick users into clicking embedded links. The document contains multiple links, including one pointing to a known malicious redirector, and others that lead to CAPTCHA pages, suggesting a phishing or malware distribution workflow. The ML classifier strongly indicates malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • PDF links to a 'free generator / game hack' redirector critical 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. CRITICAL on its own: the /app/<id>/<slug>-game-hack path shape is unambiguous scam infra, and the host rotates so a host-list match can't be relied on.
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Invisible PDF links to CAPTCHA-themed web lure high PDF_CAPTCHA_LINK_LURE
    PDF contains invisible clickable link annotations that point to a CAPTCHA/capcha-themed web path. This is a common phishing and ClickFix-style routing pattern: the PDF itself is inert, while the linked page performs the credential prompt or fake verification.
  • 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
  • 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.co/app/431946152/hack-for-unlimited-cash-in-roblox-bloxburg-game-hack In PDF document text
    • http://library.ulb.ac.id/repository/how-to-you-hack-walk-in-walls-roblox_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/coin-master-coins_GM406889139.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/how-to-bypass-roblox-cheat-engine_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/10-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/bloxburg-roblox-hacks_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/cch-hack-skin-roblox_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/but-link-says-free-robux-walter_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/minecraft-free-download-mac-full-version-2021_GM479516143.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/free-promo-codes-roblox-body_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id//repository/rbxoffers-com-free-robux_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/hacks-para-mad-city-roblox-rock-spolit_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/roblox-skull-kid-free_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/roblox-cheat-engine-money_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/what-roblox-games-has-no-cheating_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/how-to-get-free-robux-roblox-generator_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/how-to-get-free-robux-without-captcha_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/free-roblox-catolog-codes_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/free-robux-codes-not-used_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/wwwroblox-jailbreak-hack_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/how-to-get-free-robux-on-ios-2021_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_off0000316a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x316A 22792 bytes
SHA-256: b11507d110643ce919a364ead1e7ce37326639e726474a7850c6e7933ab55d3a
font_01_sfnt_off00006446.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6446 19784 bytes
SHA-256: d5f9d8899af830f8523883ee49da59386045a6def0d79f04dfde4ece5ffd83d5

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