Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a22478ec3e380cb…

MALICIOUS

PDF

44.4 KB Created: 2020-07-30 01:23:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c24cc03f3182b164b88472a82b796d51 SHA-1: 69186ea2f587ae56e67e903595c10968e9fab681 SHA-256: 1a22478ec3e380cbc741df3793b2b545a4e8ef084f872642b8d371332c93a188
150 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, many of which point to a link farm designed to redirect users to malicious sites. The primary redirector URL is https://ttraff.ru/pify?keyword=classroom+rules+list+pdf. The ML classifier strongly indicates maliciousness, and the PDF structure suggests a tactic to drive traffic to potentially harmful content.

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.ru/pify?keyword=classroom+rules+list+pdf
    • http://files.mnallergy.com/uploads/1/3/0/7/130776447/sipisofaki_luwuw.pdf
    • http://files.cheapskatesclub.net/uploads/1/3/1/3/131398221/1786115.pdf
    • http://files.mysoapkrush.com/uploads/1/3/2/3/132302987/gosenov.pdf
    • http://files.jennkarrasdesigns.com/uploads/1/3/1/4/131437225/1682746.pdf
    • http://files.carolgrice-curran.com/uploads/1/3/1/8/131871414/xijugonaru.pdf
    • https://cdn.shopify.com/s/files/1/0431/3110/9538/files/78559103054.pdf
    • https://cdn.shopify.com/s/files/1/0431/1223/5174/files/sapudalolubosekujuvum.pdf
    • https://cdn.shopify.com/s/files/1/0428/5667/7543/files/22317788356.pdf
    • https://cdn.shopify.com/s/files/1/0428/2961/1171/files/zejorepobilugixazomak.pdf
    • https://cdn.shopify.com/s/files/1/0428/0143/0695/files/83219761852.pdf
    • https://cdn.shopify.com/s/files/1/0435/8717/4557/files/kidogoxepiwobi.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/37263727017.pdf
    • https://cdn.shopify.com/s/files/1/0428/9495/0556/files/fazagidonezakaz.pdf
    • https://cdn.shopify.com/s/files/1/0428/2623/6063/files/vukebapunimapusejajuze.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/53295895336.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/
    • https://cdn.shopify.com

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000703c.bin
448518a923662dbcd4bafc5487211178103f5d83ab51252f1e7b400336f362d2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x703C 4988 bytes
font_01_sfnt_off00008136.bin
4f57ac32324978303bb09aa2125b09144dd5c19fd7c997af349ebaa6598275a8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8136 10652 bytes

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