Malicious PDF — malware analysis report

Static analysis result for SHA-256 913fbb8e864624e9…

MALICIOUS

PDF

45.9 KB Created: 2021-05-10 23:01:44 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-20
MD5: b6ba1aa3df2253e31ee1c38df0507f09 SHA-1: 2684156ed74215d3f543bbcc259e920b98775daf SHA-256: 913fbb8e864624e9741abbd132bb8707dfdf363dc9ad9b35b2511737f2ddaabe
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to known malicious redirectors and domains hosting game-related lures, such as 'free generator' or 'game hack' content. The document body and embedded links strongly suggest a phishing or malware distribution attempt, likely using a social engineering tactic to trick users into downloading further malicious content. No scripts were extracted from this sample, but the presence of malicious links and the ML classifier output indicate a high likelihood of malicious intent.

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 https://netcdn.xyz/app/431946152/how-to-change-your-roblox-username-for-free-game-hack In PDF document text
    • https://dribledasortegaucho.com.br/uploads/files/how-to-hack-people-in-roblox_GM431946152.pdfIn PDF document text
    • https://dribledasortegaucho.com.br/uploads/files/coin-master-hack-apk-download-2021_GM406889139.pdfIn PDF document text
    • https://dribledasortegaucho.com.br/uploads/files/how-to-hack-someone-on-roblox_GM431946152.pdfIn PDF document text
    • https://dribledasortegaucho.com.br/uploads/files/coin-master-free-spins-blogspot_GM406889139.pdfIn PDF document text
    • https://dribledasortegaucho.com.br/uploads/files/daily-free-spin-coin-master-link_GM406889139.pdfIn PDF document text
    • https://dribledasortegaucho.com.br/uploads/files/no-human-verification-hack-for-coin-master_GM406889139.pdfIn PDF document text
    • https://dribledasortegaucho.com.br/uploads/files/free-roblox-clothes-2021_GM431946152.pdfIn PDF document text
    • https://dribledasortegaucho.com.br/uploads/files/how-much-robux-can-you-get-with-1-million-dollars_GM431946152.pdfIn PDF document text
    • https://dribledasortegaucho.com.br/uploads/files/how-to-get-free-spins-on-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://dribledasortegaucho.com.br/uploads/files/coin-master-update-2021_GM406889139.pdfIn PDF document text
    • https://dribledasortegaucho.com.br/uploads/files/coin-master-card-collection-hack-2021_GM406889139.pdfIn PDF document text
    • https://dribledasortegaucho.com.br/uploads/files/free-spins-and-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://dribledasortegaucho.com.br/uploads/files/can-i-get-robux-for-free_GM431946152.pdfIn PDF document text
    • https://dribledasortegaucho.com.br/uploads/files/free-robux-without-offers_GM431946152.pdfIn PDF document text
    • https://dribledasortegaucho.com.br/uploads/files/fbchampion-com_GM406889139.pdfIn PDF document text
    • https://dribledasortegaucho.com.br/uploads/files/free-robux-glitch-2021_GM431946152.pdfIn PDF document text
    • https://dribledasortegaucho.com.br/uploads/files/free-coin-and-spin-link_GM406889139.pdfIn PDF document text
    • https://dribledasortegaucho.com.br/uploads/files/free-spins-coin-master-2021-today_GM406889139.pdfIn PDF document text
    • https://dribledasortegaucho.com.br/uploads/files/robux-hack-free-robux_GM431946152.pdfIn PDF document text
    • https://dribledasortegaucho.com.br/uploads/files/coin-master-free-coins-and-spins-link-2021_GM406889139.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
stream_003_off00004980.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4980 29216 bytes
SHA-256: 4d399e5121864e7baad8326897f0953c0419148d1921b6e6603e934f1e82eb04
font_01_sfnt_off00008d90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8D90 19540 bytes
SHA-256: 50ecf7285bea5802cb0b20a8b9fdcfe95df60a9d9ebe9d63dbff9f8e980eaa15

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