Malicious PDF — malware analysis report

Static analysis result for SHA-256 8325c7801b5a8724…

MALICIOUS

PDF

46.3 KB Created: 2020-08-20 12:50:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: aef198ab4d9bf3e33186895375f40132 SHA-1: d7087428628ad6b70fb2408a72bc5116c9226a31 SHA-256: 8325c7801b5a872483e12468d0011a6f6fdf465cfdf1bb77670616da562ca1a2
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a large number of embedded links, many pointing to Shopify domains, but one critical link redirects to `https://ttraff.cc/pify?keyword=nursery+rhymes+pdf+books+free`. This indicates a link farm or redirection tactic designed to obscure the final malicious destination. The ML classifier also strongly flagged this PDF as malicious. The primary attack pattern is social engineering through a lure of free nursery rhyme PDFs to trick users into clicking malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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=nursery+rhymes+pdf+books+free
    • http://files.eyespeak.org/uploads/1/3/1/3/131379321/kijawajeta-voxawoxuvige.pdf
    • https://cdn.shopify.com/s/files/1/0432/6889/8966/files/joxusop.pdf
    • https://cdn.shopify.com/s/files/1/0428/6863/7862/files/77550825275.pdf
    • https://cdn.shopify.com/s/files/1/0435/9153/2699/files/wigapugunoxo.pdf
    • https://cdn.shopify.com/s/files/1/0436/0205/1235/files/kenuwediwozawipaxatopizit.pdf
    • https://cdn.shopify.com/s/files/1/0432/2567/7982/files/romevuxunono.pdf
    • https://cdn.shopify.com/s/files/1/0438/5603/6005/files/51228759781.pdf
    • https://cdn.shopify.com/s/files/1/0432/7990/9028/files/76012563187.pdf
    • https://cdn.shopify.com/s/files/1/0432/8030/2238/files/9731683481.pdf
    • https://cdn.shopify.com/s/files/1/0427/5847/1846/files/10608882452.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/bokowolexom.pdf
    • https://cdn.shopify.com/s/files/1/0433/9014/0581/files/xavutivuvapilof.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000698d.bin
9537a7c8d559efb609fb9fcbcc1c6d7f1ad533ee68c412e557e2da37aca3c2cc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x698D 4964 bytes
font_01_sfnt_off00007a64.bin
0c2eb7e717c5d0402f8c536f4604477bd174d9a1d36dbddf1ff662783d3e3c42		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A64 10396 bytes
font_02_sfnt_off00009de8.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9DE8 4324 bytes

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