Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2d7f3c5e0fa7f3b…

MALICIOUS

PDF

41.3 KB Created: 2020-08-09 00:53:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6c12f9ffdd24fad166390f956566d776 SHA-1: 824093a230904cca84fbcbadc0216252c132f5b4 SHA-256: b2d7f3c5e0fa7f3bc6ccc53a21b83bdb9c1de5bd1dbf5be859e3315129542804
120 Risk Score

Malware Insights

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

The PDF file was identified as malicious due to a critical heuristic firing for a redirector link pointing to ttraff.cc. Additionally, it contains a large number of embedded links, characteristic of a link farm designed to distribute spam or lead users to malicious sites. The document body itself is heavily obfuscated and contains the primary malicious URL.

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.cc/pify?keyword=learn+korean+words+pdf
    • http://files.melissasteinphotography.com/uploads/1/3/0/9/130969967/452f40334.pdf
    • http://files.vicvacuum.com/uploads/1/3/2/7/132710491/02fc2ed4dcd4984.pdf
    • http://witatatok.brianneforwv.com/uploads/1/3/0/7/130738799/4502068.pdf
    • https://cdn.shopify.com/s/files/1/0431/4244/7265/files/lelijamekebajenote.pdf
    • https://cdn.shopify.com/s/files/1/0438/1510/8765/files/figejobaxuvedubajuxika.pdf
    • https://cdn.shopify.com/s/files/1/0434/1419/2285/files/40391404697.pdf
    • https://cdn.shopify.com/s/files/1/0431/6197/6994/files/67571223340.pdf
    • https://cdn.shopify.com/s/files/1/0432/5077/8269/files/no_strings_attached_nsync.pdf
    • https://cdn.shopify.com/s/files/1/0436/2086/0064/files/vuvosen.pdf
    • https://cdn.shopify.com/s/files/1/0429/6038/8252/files/2782022807.pdf
    • https://cdn.shopify.com/s/files/1/0440/4733/5574/files/72863686368.pdf
    • https://cdn.shopify.com/s/files/1/0434/0449/2965/files/kuketofojawoju.pdf
    • https://cdn.shopify.com/s/files/1/0439/7678/6078/files/how_to_ace_job_interview.pdf
    • https://cdn.shopify.com/s/files/1/0430/8670/8889/files/82504719843.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/91025233068.pdf
    • https://cdn.shopify.com/s/files/1/0429/4085/8527/files/woridikosiganib.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/xuxovozukirofavekejob.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_off0000648d.bin
b6fb808ca3d11fa054d6f1bdb5b87bc6ddec633a7574209ef69b3e10229917d4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x648D 5100 bytes
font_01_sfnt_off00007613.bin
1ea2bbe5d01bacd4c81a74a8383cb3f99004157ddb812814daebc85dd9abb38a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7613 10052 bytes

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