Malicious PDF — malware analysis report

Static analysis result for SHA-256 e44c1a14c35b9e86…

MALICIOUS

PDF

32.8 KB Created: 2021-06-28 06:54:42 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 811c46d8f0b53bb14eaac514a2868ffb SHA-1: 69e3460cbfd9382736acf5e217da6e024e6197e3 SHA-256: e44c1a14c35b9e86748a9363600de46b9850c8cd9b8fcf41f054b64edfcf234c
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains embedded links that are identified as malicious redirectors, specifically luring users with promises of game hacks and free currency. The primary malicious link is http://netcdn.co/app/431946152/how-to-get-a-free-skin-in-roblox-game-hack, which is designed to lead users to further malicious content. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest a phishing or social engineering attack, likely intended to deliver a second-stage payload or lead to credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9824

Heuristics 4

  • 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.
  • 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/how-to-get-a-free-skin-in-roblox-game-hack In PDF document text
    • https://nature-air.com.tw/upload/files/robux-place-rewards_GM431946152.pdfIn PDF document text
    • https://nature-air.com.tw/upload/files/free-robux-only-username-no-human-verification_GM431946152.pdfIn PDF document text
    • https://nature-air.com.tw/upload/files/free-coin-master-spins-hack_GM406889139.pdfIn PDF document text
    • https://nature-air.com.tw/upload/files/free-robux-without-verify_GM431946152.pdfIn PDF document text
    • https://nature-air.com.tw/upload/files/hacking-robux-for-money_GM431946152.pdfIn PDF document text
    • https://nature-air.com.tw/upload/files/coin-master-free-spins-2021_GM406889139.pdfIn PDF document text
    • https://nature-air.com.tw/upload/files/robux-hack-roblox-2021_GM431946152.pdfIn PDF document text
    • https://nature-air.com.tw/upload/files/minecraft-pe-hacks-ios_GM479516143.pdfIn PDF document text
    • https://nature-air.com.tw/upload/files/how-to-hack-roblox-accounts-2021_GM431946152.pdfIn PDF document text
    • https://nature-air.com.tw/upload/files/krnl-roblox_GM431946152.pdfIn PDF document text
    • https://nature-air.com.tw/upload/files/robuxian-com-free-robux-code-generator-roblox-code-generator_GM431946152.pdfIn PDF document text
    • https://nature-air.com.tw/upload/files/tiktok-free-like-bot_GM835599320.pdfIn PDF document text
    • https://nature-air.com.tw/upload/files/coin-master-cards-hack-2021_GM406889139.pdfIn PDF document text
    • https://nature-air.com.tw/upload/files/coin-master-hack-ios-no-jailbreak_GM406889139.pdfIn PDF document text
    • https://nature-air.com.tw/upload/files/minecraft-images-free_GM479516143.pdfIn PDF document text
    • https://nature-air.com.tw/upload/files/kuso-icu-roblox-free-robux_GM431946152.pdfIn PDF document text
    • https://nature-air.com.tw/upload/files/hacke-bubble-gum-simulator-de-roblox_GM431946152.pdfIn PDF document text
    • https://nature-air.com.tw/upload/files/free-coin-master-spin-generator_GM406889139.pdfIn PDF document text
    • https://nature-air.com.tw/upload/files/get-roebucks-com_GM431946152.pdfIn PDF document text
    • https://nature-air.com.tw/upload/files/robux-cheat_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_off00002b20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2B20 21712 bytes
SHA-256: bab5bad2ff4bf9ee498425bb0959c412e939ac8c0205cb6c2fb318bf8074117f
font_01_sfnt_off00005adb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5ADB 19208 bytes
SHA-256: a24d94e6fe0061633e848359fd9b0a54bff0ab172c81721334738697d5436389

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