Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf5d03a4c8bad7f9…

MALICIOUS

PDF

49.0 KB Created: 2020-08-17 17:10:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2d3c775a1ac266f08741dcb8224c5cc2 SHA-1: 7477f0811e8117b64b9036d4a388f27bfdc9ad94 SHA-256: cf5d03a4c8bad7f9e4df66039296af28cb20da3c8c301d3960e60b4cd7d4a59a
162 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to Shopify domains, but one critical link directs to a known malicious redirector. The document body, though heavily obfuscated, contains text suggesting a lure related to "children's story books pdf" and includes the malicious redirector URL. The presence of a "password-protected archive lure" heuristic suggests this PDF might be a precursor to delivering a password-protected archive, further indicating a malicious intent to bypass security controls.

Heuristics 4

  • 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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=children%2527+s+story+books+pdf
    • http://files.barngoddesspahrump.store/uploads/1/3/0/7/130776749/juxoxonekis.pdf
    • https://cdn.shopify.com/s/files/1/0431/2940/5600/files/34695656987.pdf
    • https://cdn.shopify.com/s/files/1/0431/5788/0996/files/organelos_de_las_bacterias.pdf
    • https://cdn.shopify.com/s/files/1/0432/5123/7032/files/tuvobipukes.pdf
    • https://cdn.shopify.com/s/files/1/0437/2047/4779/files/parasitic_diseases_of_animals.pdf
    • https://cdn.shopify.com/s/files/1/0434/3778/5240/files/free_background_pictures_for_pc.pdf
    • https://cdn.shopify.com/s/files/1/0432/1892/7778/files/35899448579.pdf
    • https://cdn.shopify.com/s/files/1/0432/0601/7186/files/zafomesudopukuwilipabogu.pdf
    • https://cdn.shopify.com/s/files/1/0429/8027/8426/files/14847450434.pdf
    • https://cdn.shopify.com/s/files/1/0445/6975/5812/files/60460959238.pdf
    • https://cdn.shopify.com/s/files/1/0441/0490/8952/files/dirunifimekaz.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_off00008342.bin
ae53580cb869e9b887bb314a1fd4436fa45bc3a12e40aac8e287d0c3c9e3ec64		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8342 5164 bytes
font_01_sfnt_off000094ce.bin
671379fae738a43bd8cbef540cb1fb89ac5de79cf30b1428eb37a423b78b35c1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x94CE 10088 bytes

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