Malicious PDF — malware analysis report

Static analysis result for SHA-256 ead963dbd93f5039…

MALICIOUS

PDF

40.8 KB Created: 2020-09-01 03:43:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8f40dabcec15d836de7b9ea2a8c6bf51 SHA-1: 31904dc1ba1c88e92f6e03e7f6b60d3f07485a2f SHA-256: ead963dbd93f50390ec10407a731721efd0944f7654397a251ae913610bc85b6
120 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, characteristic of a link farm. One of these links, 'https://ttraff.com/wix?keyword=english+grammar+exercises+worksheets+with+answers+pdf', is identified as a malicious redirector. The document body, though heavily obfuscated, appears to contain keywords related to 'English grammar exercises worksheets with answers pdf', suggesting a lure to attract users. The presence of numerous Shopify links, while mostly benign, contributes to the overall SEO poisoning or link farm strategy.

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/wix?keyword=english+grammar+exercises+worksheets+with+answers+pdf
    • https://cdn.shopify.com/s/files/1/0431/1144/8729/files/34057874882.pdf
    • https://cdn.shopify.com/s/files/1/0433/3161/6923/files/51601797931.pdf
    • https://cdn.shopify.com/s/files/1/0428/1381/6995/files/88340709499.pdf
    • https://cdn.shopify.com/s/files/1/0427/5752/1574/files/65569564913.pdf
    • https://cdn.shopify.com/s/files/1/0457/7699/4470/files/actuarial_lookup_exam_pass_rates.pdf
    • https://cdn.shopify.com/s/files/1/0433/7742/6584/files/xebakitixerexuduvezawiki.pdf
    • https://cdn.shopify.com/s/files/1/0429/8244/1113/files/49105320920.pdf
    • https://cdn.shopify.com/s/files/1/0430/4715/7914/files/tirag.pdf
    • https://cdn.shopify.com/s/files/1/0438/8470/7992/files/lemilopi.pdf
    • https://cdn.shopify.com/s/files/1/0435/2235/9451/files/nebow.pdf
    • https://cdn.shopify.com/s/files/1/0431/9005/9157/files/6146908522.pdf
    • https://cdn.shopify.com/s/files/1/0434/2949/4936/files/english_story_book_download.pdf
    • https://static.usrfiles.com/ugd/de02f3_96cc1545cf204ff38925df5cb3c87031.pdf
    • https://static.usrfiles.com/ugd/b8c837_29b87e258c684fa79ee9756f840d947d.pdf
    • https://static.usrfiles.com/ugd/3bf302_75dd013e08c74c56916494037cacb399.pdf
    • https://static.usrfiles.com/ugd/c3548c_07b872b72cf746ca97b61dc520d046ee.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_off00005ef9.bin
005d078d1e893aab20f288052f56b182d50273084f571a4ba18a58ac082d93e6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5EF9 5752 bytes
font_01_sfnt_off0000727a.bin
46c04dbbcac4a9bda6f07c3c6c5fdab11e6c3fd58e92543b9071e58d16401043		 pdf-font-stream PDF embedded font (sfnt) at offset 0x727A 10416 bytes

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