Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3d626864e8d16c8…

MALICIOUS

PDF

40.0 KB Created: 2020-08-30 11:02:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a0a43b54417b31c5ef95e68f94d48f41 SHA-1: 62eb09dda556e63ba301bf2ca5ae6afb479dd21a SHA-256: e3d626864e8d16c80ed090b39b9ce50efee184e4f66c0a8966dd75de364cf7b7
150 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, specifically pointing to 'https://ttraff.cc/wix?keyword=ielts+speaking+descriptors+public+version'. This URL is presented within the document body, suggesting a social engineering lure related to IELTS speaking descriptors. The PDF also contains a link farm, with many links pointing to static.usrfiles.com and cdn.shopify.com, though these appear to be benign. The ML classifier strongly flagged this PDF as malicious.

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=ielts+speaking+descriptors+public+version
    • https://static.usrfiles.com/ugd/b8c837_8d24675b4c5149198d1408813808f92c.pdf
    • https://static.usrfiles.com/ugd/b8c837_a6ddb78312ce49768f5daf9ceeee655e.pdf
    • https://static.usrfiles.com/ugd/9e41f0_8874db36d4b74f6aa178f9facbd8ba57.pdf
    • https://cdn.shopify.com/s/files/1/0434/2965/8790/files/87056930027.pdf
    • https://cdn.shopify.com/s/files/1/0434/3264/0679/files/8272369034.pdf
    • https://cdn.shopify.com/s/files/1/0431/8871/5682/files/leptospirosis_in_dogs.pdf
    • https://cdn.shopify.com/s/files/1/0463/2798/8385/files/11939493519.pdf
    • https://cdn.shopify.com/s/files/1/0434/6635/8934/files/cantico_delle_creature_mondadori.pdf
    • https://static.usrfiles.com/ugd/33c377_c1f6d2e9f10e43f8b4eb881a514cdd78.pdf
    • https://static.usrfiles.com/ugd/b8c837_2c5c661847a24ede85af15664830ebeb.pdf
    • https://static.usrfiles.com/ugd/b58d21_7cb9fa7a97674f1ba3ab8ddce32109b2.pdf
    • https://cdn.shopify.com/s/files/1/0431/1557/7504/files/jevijaboba.pdf
    • https://cdn.shopify.com/s/files/1/0437/2925/6613/files/google_advertising_tools.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_off00005d7e.bin
5d78b851cdb177b7004b0cef7914f3c829c192b9c2aca391d98238c8755b6f14		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5D7E 5440 bytes
font_01_sfnt_off00007008.bin
241a0f186bc553a56b3e93cbd79a0ca115b7957c2070fb89102baec307ee10bc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7008 11368 bytes

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