Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6d2a4d1908a936e…

MALICIOUS

PDF

36.9 KB Created: 2021-07-06 13:32:56 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-11
MD5: ca15ad3a0cfcbc642eeaccfd39325641 SHA-1: 24d199a2fb8311861b867c56bb81225732852e99 SHA-256: b6d2a4d1908a936ec4f3fcd83c05e06bba7af43184815926caaeae19367ddef9
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to malicious redirectors and a link farm, designed to lure users into clicking on potentially harmful content. The heuristic firings indicate the document is a lure for game hacks and exploits, directing users to suspicious URLs like http://netcdn.tw/app/406889139/10-free-spins-coin-master-game-hack. The presence of embedded URLs and the ML classification strongly suggest 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.
  • 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.
  • 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.tw/app/406889139/10-free-spins-coin-master-game-hack In PDF document text
    • https://www.captaingogo.com/uploaded_files/userfiles/files/coin-master-free-coins-and-spins-hack_GM406889139.pdfIn PDF document text
    • https://www.captaingogo.com/uploaded_files/userfiles/files/frre-robux-hack_GM431946152.pdfIn PDF document text
    • https://www.captaingogo.com/uploaded_files/userfiles/files/free-robux-generator-2021-no-verification-or-survey_GM431946152.pdfIn PDF document text
    • https://www.captaingogo.com/uploaded_files/userfiles/files/roblox-games-with-free-vip-servers_GM431946152.pdfIn PDF document text
    • https://www.captaingogo.com/uploaded_files/userfiles/files/shadow-raid-cheats-roblox_GM431946152.pdfIn PDF document text
    • https://www.captaingogo.com/uploaded_files/userfiles/files/apps-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • https://www.captaingogo.com/uploaded_files/userfiles/files/free-robux-codes-no-verification-2021_GM431946152.pdfIn PDF document text
    • https://www.captaingogo.com/uploaded_files/userfiles/files/free-spin-link-coin-master_GM406889139.pdfIn PDF document text
    • https://www.captaingogo.com/uploaded_files/userfiles/files/get-100-free-robux_GM431946152.pdfIn PDF document text
    • https://www.captaingogo.com/uploaded_files/userfiles/files/how-to-geet-free-robux-2021_GM431946152.pdfIn PDF document text
    • https://www.captaingogo.com/uploaded_files/userfiles/files/free-roblox-girl-clothes_GM431946152.pdfIn PDF document text
    • https://www.captaingogo.com/uploaded_files/userfiles/files/how-to-gfet-cheat-engine-to-work-with-roblox_GM431946152.pdfIn PDF document text
    • https://www.captaingogo.com/uploaded_files/userfiles/files/how-to-get-free-robux-on-android_GM431946152.pdfIn PDF document text
    • https://www.captaingogo.com/uploaded_files/userfiles/files/3-games-that-promise-free-robux_GM431946152.pdfIn PDF document text
    • https://www.captaingogo.com/uploaded_files/userfiles/files/free-robux-websites-2021_GM431946152.pdfIn PDF document text
    • https://www.captaingogo.com/uploaded_files/userfiles/files/free-robux-no-human-verification-2021-trackid-sp006_GM431946152.pdfIn PDF document text
    • https://www.captaingogo.com/uploaded_files/userfiles/files/haktuts-coin-master-free-daily-spins_GM406889139.pdfIn PDF document text
    • https://www.captaingogo.com/uploaded_files/userfiles/files/casper-hack-roblox_GM431946152.pdfIn PDF document text
    • https://www.captaingogo.com/uploaded_files/userfiles/files/free-gifts-coin-master_GM406889139.pdfIn PDF document text
    • https://www.captaingogo.com/uploaded_files/userfiles/files/free-robux-no-human-verification-no-survey_GM431946152.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_off00003893.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3893 23400 bytes
SHA-256: d5195e563748c40d084a8cfd765ea809cf006fd2d3ee98677dbfda91fd68679f
font_01_sfnt_off00006d61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6D61 18452 bytes
SHA-256: d0c04ff51ad59f6355ad4f24aeb86ad145506544650f67de66568f082738138f

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