Malicious PDF — malware analysis report

Static analysis result for SHA-256 375b2b2b82d30ed1…

MALICIOUS

PDF

71.0 KB Created: 2020-09-05 01:07:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ae127b525a1300e54f978f28d23726be SHA-1: 51d69dcf3bc3df266dfa42d4f56517cb885f6ff8 SHA-256: 375b2b2b82d30ed12aa3c3bd7ef432f064456eea78d63e234c136abe09506f29
150 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to a known malicious domain, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains text that appears to be a lure related to "Mathswatch foundation questions and answers". The primary IOC is the malicious redirector URL. The ML classifier also strongly indicated maliciousness.

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.club/wix?keyword=mathswatch+foundation+questions+and+answers
    • https://static.usrfiles.com/ugd/3b6424_2d8bf89e971e4fb9beebf0ec3bf633bb.pdf
    • https://static.usrfiles.com/ugd/362633_52f3f59ee2354e0db49cb6c3ba2f32ba.pdf
    • https://static.usrfiles.com/ugd/f65518_b7a8e8a7f9fb49a496cd5ac94f16a761.pdf
    • https://static.usrfiles.com/ugd/c618e9_6b36a74415c143259f07bb33e3ae1b64.pdf
    • https://cdn.shopify.com/s/files/1/0427/9438/5575/files/62812649513.pdf
    • https://cdn.shopify.com/s/files/1/0428/5349/9046/files/vojurapasiralesigujeteva.pdf
    • https://cdn.shopify.com/s/files/1/0434/8297/2326/files/64582188161.pdf
    • https://cdn.shopify.com/s/files/1/0434/8408/6424/files/20996358577.pdf
    • https://cdn.shopify.com/s/files/1/0434/1491/3191/files/basumidugani.pdf
    • https://cdn.shopify.com/s/files/1/0436/7797/4678/files/85106125258.pdf
    • https://cdn.shopify.com/s/files/1/0429/0641/9367/files/31135289349.pdf
    • https://static.usrfiles.com/ugd/b8c837_45bbcf50317944e9922dec9d260c78bc.pdf
    • https://static.usrfiles.com/ugd/50de67_356645414dc8438b95593848f7b0a5dd.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_off0000cee1.bin
1c89499bc40a718080aada069a66767da69431b510b755071c78faa0508e62bf		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCEE1 5300 bytes
font_01_sfnt_off0000e0ff.bin
72a06ba1eab3855c423b582d223718603c6486051ddb7636ff507c906b249818		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE0FF 14892 bytes

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