Malicious PDF — malware analysis report

Static analysis result for SHA-256 281d4a2b14f7258d…

MALICIOUS

PDF

41.6 KB Created: 2020-08-23 00:39:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ab574677fc4ee7131ab1f7c81b6973cf SHA-1: dbf084d981932fa1f8cd182ed478aad3be6806d0 SHA-256: 281d4a2b14f7258dad697bb973ac1f502aba8085320baf7544f57e7689e0ad2e
150 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link disguised as a 'ctet marksheet online' resource. The PDF_MALICIOUS_REDIRECTOR_LINK heuristic and the embedded URL point to ttraff.cc, a known malicious redirector. The PDF_SEO_LINK_FARM heuristic indicates a large number of external links, many hosted on Shopify, likely to obscure the malicious destination. The ML_NYX_PDF_MALICIOUS classifier strongly indicates malicious intent.

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=ctet+marksheet+online
    • http://domagi.moderngoddessliving.com/uploads/1/3/0/7/130739720/1fd1172ee0b.pdf
    • http://bosot.englandnutrition.com/uploads/1/3/0/7/130776394/8102542.pdf
    • https://cdn.shopify.com/s/files/1/0429/2637/5071/files/41034038598.pdf
    • https://cdn.shopify.com/s/files/1/0429/6281/3084/files/xafefawelo.pdf
    • https://cdn.shopify.com/s/files/1/0433/3164/9689/files/33189535030.pdf
    • https://cdn.shopify.com/s/files/1/0430/8677/4436/files/38943969275.pdf
    • https://cdn.shopify.com/s/files/1/0432/1853/4557/files/official_scrabble_dictionary_download.pdf
    • https://cdn.shopify.com/s/files/1/0438/4273/2192/files/fuzawuru.pdf
    • https://cdn.shopify.com/s/files/1/0429/7077/5706/files/zisorirapateterazojipu.pdf
    • https://cdn.shopify.com/s/files/1/0434/2182/7222/files/kevosimuje.pdf
    • https://cdn.shopify.com/s/files/1/0452/5611/4337/files/ad_nauseam_mtg_guide.pdf
    • https://cdn.shopify.com/s/files/1/0429/7595/3049/files/fagiwinib.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_off00006745.bin
6c9afff972419cca8351097a5537d572c78ff03c8c251518b0794550ad3692f9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6745 4896 bytes
font_01_sfnt_off000077bc.bin
17e50856d7ddac574acbdd55fd16185db2e9988bcd23e0078eca01163b9c03ce		 pdf-font-stream PDF embedded font (sfnt) at offset 0x77BC 10040 bytes

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