Malicious PDF — malware analysis report

Static analysis result for SHA-256 2699ff8bf1a6db00…

MALICIOUS

PDF

55.8 KB Created: 2020-08-10 13:47:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9ae2543f4f97e95dd158107fa2aa6a79 SHA-1: 8510f25d451cb413a01d526d06a018f5f93e4014 SHA-256: 2699ff8bf1a6db006d5c6af947728a126c177bf08484bf4798a04c2d589c9050
150 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.com, disguised as an academic exercise. The document also features a large number of external links, many pointing to Shopify domains, likely as part of a link farm to improve search engine ranking for malicious content. The ML classifier strongly indicated maliciousness, and the PDF structure itself is suspicious due to the embedded link farm.

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.com/pify?keyword=exercice+sur+barycentre+pdf
    • http://files.learningmanager.ro/uploads/1/3/1/4/131437379/zipixe-xidigirut.pdf
    • http://woked.trigonarchitect.com/uploads/1/3/2/6/132682883/jilek-bimes-sosebowet-lepeduxidof.pdf
    • http://files.villamarouette.com/uploads/1/3/0/7/130776712/mupezazisiwelokojab.pdf
    • http://files.thecuriouscatgiftshop.com/uploads/1/3/2/6/132681596/puwakir.pdf
    • https://cdn.shopify.com/s/files/1/0431/9110/7742/files/corpus_juris_civilis_justinian.pdf
    • https://cdn.shopify.com/s/files/1/0430/4899/2919/files/51913972824.pdf
    • https://cdn.shopify.com/s/files/1/0433/4062/8120/files/21605594930.pdf
    • https://cdn.shopify.com/s/files/1/0431/7039/8372/files/88528551150.pdf
    • https://cdn.shopify.com/s/files/1/0429/4190/7110/files/que_es_el_branding_libro.pdf
    • https://cdn.shopify.com/s/files/1/0432/3203/4980/files/midland_75-_822_manual.pdf
    • https://cdn.shopify.com/s/files/1/0430/6694/9799/files/89625935022.pdf
    • https://cdn.shopify.com/s/files/1/0432/7545/2569/files/81661053726.pdf
    • https://cdn.shopify.com/s/files/1/0453/8872/6440/files/22198969831.pdf
    • https://cdn.shopify.com/s/files/1/0451/9854/0949/files/56840842032.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/gatafuruzakelimosileraji.pdf
    • https://cdn.shopify.com/s/files/1/0434/6934/0822/files/86405480036.pdf
    • https://cdn.shopify.com/s/files/1/0430/5921/6537/files/40569682980.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_off0000810e.bin
27d53b1627a106b28fb66eeda5660a0fb1133bf615a47770a81aeecc9a25ef93
pdf-font-stream PDF embedded font (sfnt) at offset 0x810E 5156 bytes
font_01_sfnt_off000092a4.bin
c6f1b3efb3806cb87e359f30db3302d58bdb311dbf04c0503ad196e16506b7b2
pdf-font-stream PDF embedded font (sfnt) at offset 0x92A4 15992 bytes
font_02_sfnt_off0000c1eb.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34
pdf-font-stream PDF embedded font (sfnt) at offset 0xC1EB 4324 bytes