Malicious PDF — malware analysis report

Static analysis result for SHA-256 55ca903e78a78e28…

MALICIOUS

PDF

34.5 KB Created: 2021-06-28 10:04:57 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 50989e8f9ab9736ccc21156eda7f8570 SHA-1: 86017cc98a55617c7288f161addf1be9b4d967a2 SHA-256: 55ca903e78a78e28769e73ad75ba598bf9ccc3b9607ae69f6aacb21091650f97
160 Risk Score

Malware Insights

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

This PDF document contains multiple links that redirect to malicious infrastructure, masquerading as free game hacks and exploits. The ML classifier strongly indicated maliciousness, and the document body confirms the lure. The primary IOC is the redirector URL, which likely leads to a second-stage payload or phishing page.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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/free-exploits-roblox-reddit-game-hack In PDF document text
    • http://ycstamping.com.tw/image/data/files/free-robux-hack-no-download-no-survey-no-offers_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/free-robux-hack-2021_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/coin-master-hack-without-verification_GM406889139.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/free-roblox-accounts-with-robux-that-work-not-banned_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/hacks-para-roblox_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/http-bit-ly-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/codes-how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/free-robux-generator-no-survey-no-download-no-human-verification_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/roblox-trade-hack_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/get-free-robux-no-verification_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/coin-master-free-daily-rewards_GM406889139.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/free-robux-computer-generator_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/free-download-roblox-tshirt_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/coin-master-hack-online-link_GM406889139.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/roblox-free-script-executor-2021_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/coin-master-free-gifts_GM406889139.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/how-to-hack-roblox-and-give-yourself-guns_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/sky-x-roblox-hack_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/7-year-old-roblox_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/free-minecraft-website_GM479516143.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000304c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x304C 22132 bytes
SHA-256: 3a1c5f20c83d7f2df5622a059def5a300df66ae1221ac4737a9045d6571a73bf
font_01_sfnt_off0000613b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x613B 19224 bytes
SHA-256: 40f453e122301f1b3694ad5a8e001667ec32132f7e45f247ee4469ae78b70f04

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