Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec8f3d39b9b43c6c…

MALICIOUS

PDF

72.0 KB Created: 2020-08-20 19:32:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b5910b43d16c5510aff720dad0bc52a0 SHA-1: e5ae6d460752194f398ba40370434416872931c7 SHA-256: ec8f3d39b9b43c6cd772e609a01755cc33f1aee4fe74fdc29dee5f7173248ceb
150 Risk Score

Malware Insights

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

The PDF file was flagged by multiple critical heuristics for containing malicious redirector links and a large number of external PDF links, suggesting a link farm. One of the embedded URLs, 'https://ttraff.cc/pify?keyword=ajax+request+date+format', is identified as a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body appears to be heavily obfuscated or corrupted, but the presence of the malicious URL is sufficient evidence for the attack pattern.

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=ajax+request+date+format
    • http://fisedu.hpdavis.com/uploads/1/3/0/8/130813765/mininupa.pdf
    • http://nanoz.snazzydesigner.com/uploads/1/3/1/6/131607240/7383263.pdf
    • https://cdn.shopify.com/s/files/1/0431/7652/5988/files/88817667720.pdf
    • https://cdn.shopify.com/s/files/1/0430/7006/2753/files/49997472313.pdf
    • https://cdn.shopify.com/s/files/1/0431/3179/7668/files/30714300576.pdf
    • https://cdn.shopify.com/s/files/1/0436/0273/9362/files/tesej.pdf
    • https://cdn.shopify.com/s/files/1/0428/2223/8375/files/powered_by_mediaxxxscript_com.pdf
    • https://cdn.shopify.com/s/files/1/0434/6091/9446/files/felozakobow.pdf
    • https://cdn.shopify.com/s/files/1/0430/2517/0595/files/brahmacharya_download.pdf
    • https://cdn.shopify.com/s/files/1/0435/5663/4787/files/articles_grammar_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0429/5612/8412/files/17768126597.pdf
    • https://cdn.shopify.com/s/files/1/0427/5827/5238/files/fegisulavamozejubewukugin.pdf
    • https://cdn.shopify.com/s/files/1/0438/1150/4288/files/17222625906.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_off0000cdc8.bin
5748cfdae0e95b736a8290b2bc34a82cb612acd7f2f0aca04e2f02f25febf95b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCDC8 5280 bytes
font_01_sfnt_off0000dfb0.bin
7c6fee1db37fecc09d8a892e97c401ff956369dd1d0c9f13e1ab021d32085339		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDFB0 15508 bytes

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