Malicious PDF — malware analysis report

Static analysis result for SHA-256 cca67457e6e4fd91…

MALICIOUS

PDF

51.9 KB Created: 2020-08-30 10:49:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bc9f31725180e1fbcb82c2e044cbed23 SHA-1: f688bd33014b5e78f3f289385d295a214be9bf13 SHA-256: cca67457e6e4fd91d4b99fbe6422e9b1165b1fc505b3f5d142021c893912c914
150 Risk Score

Malware Insights

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

The PDF file contains a significant number of embedded links, with a critical heuristic firing indicating a link to a known malicious redirector. The document body, though heavily obfuscated, contains the malicious URL. The presence of numerous links, many hosted on Shopify, suggests a link farm or SEO poisoning tactic to distribute malicious content. No scripts were extracted, and the primary threat appears to be the redirection to the malicious URL.

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/wix?keyword=crossfit+girl+wods
    • https://cdn.shopify.com/s/files/1/0430/5590/6973/files/zinuzagozigodabomak.pdf
    • https://cdn.shopify.com/s/files/1/0431/9812/0094/files/givube.pdf
    • https://cdn.shopify.com/s/files/1/0436/4884/3934/files/88724856750.pdf
    • https://cdn.shopify.com/s/files/1/0429/3387/8940/files/fexomax.pdf
    • https://cdn.shopify.com/s/files/1/0435/8301/3023/files/iso_to_usb.pdf
    • https://cdn.shopify.com/s/files/1/0435/6059/9711/files/86855276631.pdf
    • https://cdn.shopify.com/s/files/1/0440/8662/4406/files/verbos_conceptuales_procedimentales_y_actitudinales.pdf
    • https://cdn.shopify.com/s/files/1/0436/0876/8675/files/12877402266.pdf
    • https://static.usrfiles.com/ugd/eb6612_041cd6a95e0c4ef8998c208629892bcf.pdf
    • https://static.usrfiles.com/ugd/b8c837_5a19685ffd1140d99fbc63c84effa6a6.pdf
    • https://static.usrfiles.com/ugd/b8c837_60c32697e40e47429aa316643a28fa53.pdf
    • https://static.usrfiles.com/ugd/79e0dc_3af6796e77ce4e9d9b38560185dac61f.pdf
    • https://cdn.shopify.com/s/files/1/0438/5452/8677/files/change_bitmap_image_to.pdf
    • https://cdn.shopify.com/s/files/1/0438/7730/2427/files/26674244994.pdf
    • https://cdn.shopify.com/s/files/1/0434/5475/9065/files/vifij.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_off00008f73.bin
f876035324abdc906a707aa2bdcd178dc4da58640935dea4ad8cb5d0fb6990d4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8F73 4864 bytes
font_01_sfnt_off0000a019.bin
b4c0e7011495ccd267c31d5b97e0d8c94bcdf6bd0c319074dfe5ee2c07b431c1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA019 10264 bytes

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