Malicious PDF — malware analysis report

Static analysis result for SHA-256 41ad84b073d762db…

MALICIOUS

PDF

31.6 KB Created: 2020-08-29 19:40:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 54e4140f343b5529d23e18d97ca47002 SHA-1: 42769723ff941897b587925c067e4ada69a5fb01 SHA-256: 41ad84b073d762db8e5173fb1df6c0b2e7d3b4f1ab54f608a9841b34a0bc6b48
120 Risk Score

Malware Insights

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

The PDF file contains a heuristic firing for PDF_MALICIOUS_REDIRECTOR_LINK, indicating it directs users to a known malicious URL. Additionally, PDF_SEO_LINK_FARM suggests the document is part of a larger scheme to generate traffic through numerous linked PDFs. The embedded URL https://ttraff.ru/wix?keyword=mega+bloks+castle+instructions is the primary indicator of malicious redirection. The document body, though heavily obfuscated, contains references to 'Mega bloks castle instructions' and the malicious URL, reinforcing the lure.

Heuristics 3

  • 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.
  • 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://ttraff.ru/wix?keyword=mega+bloks+castle+instructions
    • https://static.usrfiles.com/ugd/b8c837_9f6098a780084613aac26b7d57425968.pdf
    • https://static.usrfiles.com/ugd/b8c837_aaf9192b759d4957b97fc0fac42a4e34.pdf
    • https://static.usrfiles.com/ugd/b8c837_fb904af2b3944c8bbcb01118cdf8b5df.pdf
    • https://static.usrfiles.com/ugd/b8c837_2ef4a914d18b43e38ab06a1d212f65a3.pdf
    • https://cdn.shopify.com/s/files/1/0429/9672/7961/files/the_lion_guard_coloring_sheets.pdf
    • https://cdn.shopify.com/s/files/1/0431/2121/3591/files/sheetrock_dust_control_joint_compound_review.pdf
    • https://cdn.shopify.com/s/files/1/0437/3096/0549/files/83295521300.pdf
    • https://cdn.shopify.com/s/files/1/0431/3903/9388/files/windows_11_download.pdf
    • https://cdn.shopify.com/s/files/1/0432/2879/0946/files/96131316302.pdf
    • https://cdn.shopify.com/s/files/1/0440/5913/2054/files/jopixasaxa.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000405b.bin
65dbb9fe629450bc76ef5e2dc38564d34afcb94174a9f7d24b4d3ba2ddfa41cb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x405B 5176 bytes
font_01_sfnt_off0000520e.bin
0daa2e79b7a33627f2872f18b9c62f7789fa416fa29aa6cc8b21ae79132f6b65		 pdf-font-stream PDF embedded font (sfnt) at offset 0x520E 9436 bytes

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