Malicious PDF — malware analysis report

Static analysis result for SHA-256 522b9c1e70ab7a6a…

MALICIOUS

PDF

50.3 KB Created: 2020-09-04 10:16:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 059b8c61cdb36ee6d5989cf59b8c97b7 SHA-1: 8059c8d1216d5da9005f2123b50e705c622559ae SHA-256: 522b9c1e70ab7a6ab34de5ff79084bab6db9ca666654df74cbdf005ec1157556
150 Risk Score

Malware Insights

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

The PDF contains a mass of external links, including a critical link to a known malicious redirector at `https://ttraff.me/wix?keyword=digestive+system+labeling+quiz+answers`. The document body, though corrupted, also contains this URL, suggesting it is the primary lure. The presence of numerous other PDF links indicates a link farm strategy to improve search engine ranking and distribute malicious content. No scripts were extracted, but the PDF structure itself is used for the attack.

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.me/wix?keyword=digestive+system+labeling+quiz+answers
    • https://static.usrfiles.com/ugd/b48b60_2eb4ce28084b4af79479c609a5514e41.pdf
    • https://static.usrfiles.com/ugd/e2b09b_ba2d3fd1211e43aa9db9f2c18da208ec.pdf
    • https://static.usrfiles.com/ugd/269bb8_f6a38ff488f24ccd800111eb9ae84ca9.pdf
    • https://static.usrfiles.com/ugd/4c3d6a_52f647cfc2054cf08330b31a98649854.pdf
    • https://static.usrfiles.com/ugd/7f614e_3e822a9397c84bf3b17f8a712f1a9a2a.pdf
    • https://cdn.shopify.com/s/files/1/0435/1574/0314/files/gatule.pdf
    • https://cdn.shopify.com/s/files/1/0430/8841/2836/files/plus_size_bra_measuring_guide.pdf
    • https://cdn.shopify.com/s/files/1/0438/7779/3960/files/liketadumasopilal.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/fakuwonilojovaxibudebu.pdf
    • https://cdn.shopify.com/s/files/1/0431/0056/9766/files/pes_anserine_bursitis_rehab.pdf
    • https://cdn.shopify.com/s/files/1/0431/0591/0935/files/pabarozisimofinefuf.pdf
    • https://cdn.shopify.com/s/files/1/0431/6918/5943/files/18920784271.pdf
    • https://cdn.shopify.com/s/files/1/0430/6042/8962/files/24945079308.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_off000069d4.bin
6b6756bbe40337619c24a4b9852844d09d187bd8c30b75dd298d56725c9c01d9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x69D4 5576 bytes
font_01_sfnt_off00007cd9.bin
fba90300173cf4c9101e75cd285e95653862096eaddea24d6416bee400e228e2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7CD9 13032 bytes
font_02_sfnt_off0000a607.bin
1b7fdefb58f2e2bd62542d49c7ed4334cc2b40fec487a686cf4f11a661fbf486		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA607 16448 bytes

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