Malicious PDF — malware analysis report

Static analysis result for SHA-256 b566fd0758fe68a0…

MALICIOUS

PDF

51.5 KB Created: 2021-06-03 14:48:58 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-21
MD5: f2e94717ca81fa7757bd88fbffed8371 SHA-1: 63156200654d99f68509d62301cae8fd0bf79c32 SHA-256: b566fd0758fe68a0eaf170c23fca12ad49c6ec8d4f756180f15a469a868ca8de
260 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document contains multiple links to external websites, many of which are SEO-optimized PDFs, and one direct link to a suspicious generator site. The document also contains a lure instructing the user to copy and paste content into a shell, indicating an attempt to trick the user into executing commands. The ML classifier also flagged this document with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9464

Heuristics 6

  • 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.
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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.online/app/479516143/minecraft-pe-apk-download-free-015-0-game-hack In PDF document text
    • https://www.jcn.co.uk/uploads/files/files/free-hacks-for-coin-master_GM406889139.pdfIn PDF document text
    • https://www.jcn.co.uk/uploads/files/files/how-to-earn-free-spin-in-coin-master_GM406889139.pdfIn PDF document text
    • https://www.jcn.co.uk/uploads/files/files/free-roblox-accounts-with-robux-2021_GM431946152.pdfIn PDF document text
    • https://www.jcn.co.uk/uploads/files/files/microsoft-rewards-robux_GM431946152.pdfIn PDF document text
    • https://www.jcn.co.uk/uploads/files/files/can-you-get-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • https://www.jcn.co.uk/uploads/files/files/roblox-hack-com_GM431946152.pdfIn PDF document text
    • https://www.jcn.co.uk/uploads/files/files/robuxlove-net-free-robux_GM431946152.pdfIn PDF document text
    • https://www.jcn.co.uk/uploads/files/files/blogger-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • https://www.jcn.co.uk/uploads/files/files/coin-master-daily-spin-free_GM406889139.pdfIn PDF document text
    • https://www.jcn.co.uk/uploads/files/files/how-to-coin-master-spin-hack_GM406889139.pdfIn PDF document text
    • https://www.jcn.co.uk/uploads/files/files/how-to-download-minecraft-for-free-on-iphone_GM479516143.pdfIn PDF document text
    • https://www.jcn.co.uk/uploads/files/files/coinmasterdailyfreespins-com_GM406889139.pdfIn PDF document text
    • https://www.jcn.co.uk/uploads/files/files/minecraft-java-edition-for-free_GM479516143.pdfIn PDF document text
    • https://www.jcn.co.uk/uploads/files/files/free-unlimited-robux_GM431946152.pdfIn PDF document text
    • https://www.jcn.co.uk/uploads/files/files/coin-master-free-spins-today-daily-links_GM406889139.pdfIn PDF document text
    • https://www.jcn.co.uk/uploads/files/files/coin-master-hack-apk-april-12-2021_GM406889139.pdfIn PDF document text
    • https://www.jcn.co.uk/uploads/files/files/withdraw-robux_GM431946152.pdfIn PDF document text
    • https://www.jcn.co.uk/uploads/files/files/legit-coin-master-hack-site-zyngaplayerforumscom_GM406889139.pdfIn PDF document text
    • https://www.jcn.co.uk/uploads/files/files/uprobuxcom-free-robux_GM431946152.pdfIn PDF document text
    • https://www.jcn.co.uk/uploads/files/files/free-spin-link-coin-master-today_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000055ca.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x55CA 30500 bytes
SHA-256: 99bcb861098356b3d0044199d2a1e93a77bc9bfe89611175693a43a517b6a65c
font_01_sfnt_off00009a9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9A9C 2820 bytes
SHA-256: 972979c3a46100cf5f8fd289bc6fbd2496ff75fec0e3f6753648c72ec6eba714
font_02_sfnt_off0000a43b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA43B 19204 bytes
SHA-256: ec2aa283725203a2a31dc6065d6810c0678edc39fe02699463f3971a6e6b9123

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