Malicious PDF — malware analysis report

Static analysis result for SHA-256 935ca76f645bf109…

MALICIOUS

PDF

40.8 KB Created: 2020-08-11 07:43:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b02801e064d1d2e5410012f5bfd393d1 SHA-1: 5d02accdc98c8a1c8bb70ec7df3ded723971c2c3 SHA-256: 935ca76f645bf109d5fff740a41b810f7eb2df779e16dbe5c522e5cb25b419ab
150 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link disguised within the document body, aiming to lure users to a potentially harmful site. The presence of a large number of external PDF links, many hosted on Shopify, suggests a link farm or SEO poisoning tactic. The ML 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/wb?keyword=pet%20speaking%20part%203%20pictures%20pdf
    • http://files.completewellnesscenter.net/uploads/1/3/1/8/131871745/cae1df.pdf
    • http://files.normawalton.ca/uploads/1/3/1/3/131379312/bb7627f.pdf
    • http://files.chehandbells.org/uploads/1/3/0/8/130874429/salimemupepukevoxof.pdf
    • https://cdn.shopify.com/s/files/1/0429/5373/6351/files/xubexezejazedozed.pdf
    • https://cdn.shopify.com/s/files/1/0429/9004/3285/files/7390775150.pdf
    • https://cdn.shopify.com/s/files/1/0439/1901/6104/files/63393534473.pdf
    • https://cdn.shopify.com/s/files/1/0432/0998/2107/files/tubejeme.pdf
    • https://cdn.shopify.com/s/files/1/0432/8924/7894/files/tenasorosegonojerivo.pdf
    • https://cdn.shopify.com/s/files/1/0433/9073/0398/files/butojiwafelotepogewedalew.pdf
    • https://cdn.shopify.com/s/files/1/0437/6556/3541/files/letter_d_worksheets_for_kindergarten_pdf.pdf
    • https://cdn.shopify.com/s/files/1/0431/6128/8868/files/cancionero_para_guitarra_principiantes.pdf
    • https://cdn.shopify.com/s/files/1/0428/3429/6988/files/10003139382.pdf
    • https://cdn.shopify.com/s/files/1/0435/8098/1403/files/98165731327.pdf
    • https://cdn.shopify.com/s/files/1/0431/2596/4957/files/volukebe.pdf
    • https://cdn.shopify.com/s/files/1/0435/0715/5110/files/blackpink_songs_lyrics.pdf
    • https://cdn.shopify.com/s/files/1/0439/0522/0776/files/fibras_textiles_naturales.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/51439980706.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_off00005ed0.bin
399b7e4d8d570ef63f252f554a13bd14d411f4778bad2d92c91d55aa398e3aa5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5ED0 5520 bytes
font_01_sfnt_off0000719a.bin
1e8a94775992603b4ca05fe44bcaf3de975a826becb466854bca17e0682a7f76		 pdf-font-stream PDF embedded font (sfnt) at offset 0x719A 11344 bytes

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