Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a1a4cc002730f43…

MALICIOUS

PDF

35.2 KB Created: 2021-06-28 13:42:23 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 626662bec979a719b6a5a49f13cfeb81 SHA-1: b585bb0d5e561dc5619bc5d48428abfd125c379f SHA-256: 2a1a4cc002730f43d26b0f3d1ec261db9178f09f37a69b6269bdfca0089a2cb9
220 Risk Score

Malware Insights

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

The PDF contains multiple links to a redirector hosted at 'netcdn.co', which is flagged as malicious. These links are presented as 'free generators' or 'game hacks', indicating a social engineering lure. The document also contains a large number of links to external PDFs, likely for SEO manipulation or to host further malicious content. The ML classifier strongly indicates maliciousness.

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.co/app/431946152/script-hack-robox-robux-game-hack In PDF document text
    • https://www.summerland.com.tw/upload/files/free-roblox-hair-codes_GM431946152.pdfIn PDF document text
    • https://www.summerland.com.tw/upload/files/how-to-get-free-robux-com_GM431946152.pdfIn PDF document text
    • https://www.summerland.com.tw/upload/files/bloxawards-com-earn-free-robux_GM431946152.pdfIn PDF document text
    • https://www.summerland.com.tw/upload/files/roblox-frisk-shirt-free_GM431946152.pdfIn PDF document text
    • https://www.summerland.com.tw/upload/files/roblox-free-bc-2021_GM431946152.pdfIn PDF document text
    • https://www.summerland.com.tw/upload/files/roblox-hack-2021-no-human-verification_GM431946152.pdfIn PDF document text
    • https://www.summerland.com.tw/upload/files/free-coin-master-coins-and-spins_GM406889139.pdfIn PDF document text
    • https://www.summerland.com.tw/upload/files/how-to-install-minecraft-for-free_GM479516143.pdfIn PDF document text
    • https://www.summerland.com.tw/upload/files/coin-master-free-spin-realme-products_GM406889139.pdfIn PDF document text
    • https://www.summerland.com.tw/upload/files/download-tiktok-for-free_GM835599320.pdfIn PDF document text
    • https://www.summerland.com.tw/upload/files/master-coin-free-spin-daily_GM406889139.pdfIn PDF document text
    • https://www.summerland.com.tw/upload/files/free-roblox-gift-card-codes-2021_GM431946152.pdfIn PDF document text
    • https://www.summerland.com.tw/upload/files/coin-master-daily-free-spin-and-coin_GM406889139.pdfIn PDF document text
    • https://www.summerland.com.tw/upload/files/free-minecraft-hacks_GM479516143.pdfIn PDF document text
    • https://www.summerland.com.tw/upload/files/coin-master-hack-https-coinms-net_GM406889139.pdfIn PDF document text
    • https://www.summerland.com.tw/upload/files/minecraft-windows-free_GM479516143.pdfIn PDF document text
    • https://www.summerland.com.tw/upload/files/how-to-get-free-robux-without-offers_GM431946152.pdfIn PDF document text
    • https://www.summerland.com.tw/upload/files/get-free-robux-roblox-works_GM431946152.pdfIn PDF document text
    • https://www.summerland.com.tw/upload/files/www-bandicam-com-free-robux_GM431946152.pdfIn PDF document text
    • https://www.summerland.com.tw/upload/files/free-unused-noob-roblox-accounts_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_off00003294.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3294 22360 bytes
SHA-256: 80e8ebf8af96e2a202fe2b491263db0fa9e8ab4781bf15c994f70f5e691c6ed6
font_01_sfnt_off00006440.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6440 19120 bytes
SHA-256: 73f6e522c660e5fa49fdf39af04602dec761bbe9f749387ae2daff682e15fbef

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