Malicious PDF — malware analysis report

Static analysis result for SHA-256 326ab528964cbec7…

MALICIOUS

PDF

56.4 KB Created: 2020-08-31 09:28:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ba8852957a6b89277d6f05344f15b098 SHA-1: 18a3a4af36c91eecdd93de6329f9811c28028709 SHA-256: 326ab528964cbec7c5bc59dab642e83146f5d12cfec4e19ac59d5c504cf97319
150 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'ttraff.cc', which is a known malicious infrastructure. Additionally, it exhibits characteristics of a PDF link farm, embedding numerous external links, primarily hosted on Shopify. The ML classifier strongly supports the malicious verdict. The document body, though heavily obfuscated, contains the malicious URL and appears to be a lure related to geometry, likely a pretext for the 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/wix?keyword=la+geometria+en+la+vida+cotidiana
    • https://cdn.shopify.com/s/files/1/0431/2930/7287/files/77540436539.pdf
    • https://cdn.shopify.com/s/files/1/0430/8362/8708/files/brilliancy_fiddle_tune.pdf
    • https://cdn.shopify.com/s/files/1/0464/4788/6504/files/dexogesepomisamufugupu.pdf
    • https://cdn.shopify.com/s/files/1/0434/6894/7616/files/roku_2_xd_manual.pdf
    • https://static.usrfiles.com/ugd/b8c837_111f842161c24db69370aa173d83e0fb.pdf
    • https://cdn.shopify.com/s/files/1/0433/4649/3591/files/tenuvow.pdf
    • https://cdn.shopify.com/s/files/1/0438/0386/9346/files/area_and_perimeter_of_parallelogram.pdf
    • https://cdn.shopify.com/s/files/1/0434/5420/2018/files/arsenal_vs_cardiff_goals.pdf
    • https://cdn.shopify.com/s/files/1/0438/4063/5042/files/apprendre_le_russe_gratuit.pdf
    • https://static.usrfiles.com/ugd/b8c837_2162611fe1b243b7a8ade55af71b7961.pdf
    • https://static.usrfiles.com/ugd/b8c837_6ae7a3b30e464cac819b16d734e8f7b0.pdf
    • https://static.usrfiles.com/ugd/a2c2bc_d49801e745b04662b59427ff1fc7b56e.pdf
    • https://static.usrfiles.com/ugd/b8c837_d08a0134108a41e787762ba4e8b11739.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_off0000911f.bin
f41a65024b85bd4890f9d262db4a84d202a6bd6e949d03582301e5d972200c73		 pdf-font-stream PDF embedded font (sfnt) at offset 0x911F 4872 bytes
font_01_sfnt_off0000a195.bin
813dd96460c4610b25aa7758f9707944bc3b68790550c60474b3815581bbb20f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA195 11004 bytes
font_02_sfnt_off0000c53d.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC53D 4324 bytes

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