Malicious PDF — malware analysis report

Static analysis result for SHA-256 255a2188acca8c8c…

MALICIOUS

PDF

41.0 KB Created: 2020-08-19 05:21:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b0e37364f40454374055c3481aec1b5a SHA-1: 43c55db9ae28e65703f461ee1b893531e0c17fd1 SHA-256: 255a2188acca8c8c9dc632aef39ddf5c6fb3af23eacb335f235f07e3661c46c2
150 Risk Score

Malware Insights

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

The PDF document was flagged as malicious due to a critical heuristic indicating it contains a redirector link to a known malicious infrastructure. Additionally, it features a large number of embedded external links, characteristic of a link farm designed to distribute malicious content. The primary malicious IOC is the redirector URL, which likely serves as the initial point of contact for further malicious activity.

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.com/pify?keyword=splash+screen+library+android
    • http://files.laurabreaux.net/uploads/1/3/2/3/132303388/rodumadibupedok.pdf
    • http://files.redmousedesigns.com/uploads/1/3/1/4/131438823/pewigu.pdf
    • http://files.vk5pas.com/uploads/1/3/0/7/130739028/pamav.pdf
    • http://files.sacredheartsisters.org/uploads/1/3/0/8/130874599/82ba8ce33bb39.pdf
    • https://cdn.shopify.com/s/files/1/0432/5313/7576/files/65209584580.pdf
    • https://cdn.shopify.com/s/files/1/0429/7519/9391/files/1494218049.pdf
    • https://cdn.shopify.com/s/files/1/0432/0421/4942/files/dojukunufu.pdf
    • https://cdn.shopify.com/s/files/1/0432/6211/6002/files/hp_4500_printer_manual.pdf
    • https://cdn.shopify.com/s/files/1/0437/7647/5290/files/46113300806.pdf
    • https://cdn.shopify.com/s/files/1/0432/3531/1775/files/madukamamemoro.pdf
    • https://cdn.shopify.com/s/files/1/0429/8365/3527/files/60873199508.pdf
    • https://cdn.shopify.com/s/files/1/0432/8652/8155/files/69799790755.pdf
    • https://cdn.shopify.com/s/files/1/0431/7757/4557/files/dabonivepeto.pdf
    • https://cdn.shopify.com/s/files/1/0435/8373/3915/files/mbdgo_full_form_medical.pdf
    • https://cdn.shopify.com/s/files/1/0432/1532/3291/files/career_development_strategies.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_off00005fe5.bin
f0d27176ba78976de77d01cdeb6504d9333e29e80f90158fb7bedb2232d4341a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5FE5 5508 bytes
font_01_sfnt_off0000727f.bin
b0294bbf78c9d7081860896835b9c22e03408e4fdc3d051a3f214d7e2c844bef		 pdf-font-stream PDF embedded font (sfnt) at offset 0x727F 10748 bytes

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