Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a4785db69dac2da…

MALICIOUS

PDF

39.2 KB Created: 2020-08-19 07:07:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b52bf2d13eb94b0fa7388b13d47517b1 SHA-1: d6d077070c99d421e46f3f34f1bf456936798465 SHA-256: 9a4785db69dac2dab327aac9542abf8ef0bd3dbfefdf191f16664b10d8384fc7
150 Risk Score

Malware Insights

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

The PDF was flagged as malicious due to a critical heuristic identifying it as a redirector link to known malicious infrastructure. It also contains a large number of external PDF links, suggesting a link farm. The primary malicious URL identified is https://ttraff.cc/pify?keyword=ost+the+amazing+spider+man+2, which is likely used to lure victims. No scripts were extracted, and the document body was heavily obfuscated.

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=ost+the+amazing+spider+man+2
    • http://wumovezav.fredoniaenactus.org/uploads/1/3/0/7/130775740/f5baae1e.pdf
    • https://cdn.shopify.com/s/files/1/0436/0781/8398/files/jafizaxu.pdf
    • https://cdn.shopify.com/s/files/1/0437/7070/8125/files/41715527884.pdf
    • https://cdn.shopify.com/s/files/1/0429/4384/0412/files/levuxunosu.pdf
    • https://cdn.shopify.com/s/files/1/0434/1648/6040/files/xojij.pdf
    • https://cdn.shopify.com/s/files/1/0438/0606/4801/files/84237559805.pdf
    • https://cdn.shopify.com/s/files/1/0433/4531/3941/files/fozoxatezobajadowi.pdf
    • https://cdn.shopify.com/s/files/1/0431/4238/1725/files/27642382280.pdf
    • https://cdn.shopify.com/s/files/1/0438/2071/2098/files/finite_mathematics_applied_calculus.pdf
    • https://cdn.shopify.com/s/files/1/0434/1481/4885/files/self_driving_cars.pdf
    • https://cdn.shopify.com/s/files/1/0428/2603/9463/files/86006623250.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_off00005b08.bin
728813eeeb04de84e566d54c44e30cad6ccce760c7eb0069d340719897c094b4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5B08 5552 bytes
font_01_sfnt_off00006dc6.bin
5c4a833c406fe4f5ae7f8f8a9b15d0f124d86d7a24ae032f6e90bd8760afd7b5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6DC6 10128 bytes

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