Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac0a772c833123cd…

MALICIOUS

PDF

64.8 KB Created: 2020-08-29 05:24:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a6512573e1c9b211f0acb37712170681 SHA-1: b772e92cb3f235da19f0d34b0f1b39dab07d5021 SHA-256: ac0a772c833123cd776e7bfa961ea491a7791feaab41feea36dcb65d5ff2cdc4
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a link that redirects to a known malicious domain, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains the URL that is also present in the heuristics. The ML classifier also strongly indicated maliciousness. The primary attack vector appears to be a lure to a malicious website.

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/wix?keyword=ace+personal+trainer+manual+4th+edition+pdf
    • https://static.usrfiles.com/ugd/b8c837_060138f2871a49a7bc2d626374364a97.pdf
    • https://static.usrfiles.com/ugd/b8c837_1f2326bf082a4b47879fbc8d03a44528.pdf
    • https://static.usrfiles.com/ugd/b8c837_aab46271fa4b4c2c8da4aa8f71a5113e.pdf
    • https://static.usrfiles.com/ugd/b8c837_3b0faf57070d4187bef536e0dec52e7e.pdf
    • https://static.usrfiles.com/ugd/b8c837_928da8534db641c1a63a7a9cb8334c3c.pdf
    • https://cdn.shopify.com/s/files/1/0430/4925/5066/files/42561217133.pdf
    • https://cdn.shopify.com/s/files/1/0435/3209/1546/files/92915873000.pdf
    • https://cdn.shopify.com/s/files/1/0429/1638/0831/files/file_upload_javascript.pdf
    • https://cdn.shopify.com/s/files/1/0434/5036/8152/files/synonyms_for_ielts_writing_task_1.pdf
    • https://cdn.shopify.com/s/files/1/0431/3550/0439/files/27587503899.pdf
    • https://cdn.shopify.com/s/files/1/0433/7968/7587/files/first_aid_step_1_2018_free_downl.pdf
    • https://static.usrfiles.com/ugd/b8c837_45a2e0854b5641fba2cdaac8bd7316d6.pdf
    • https://static.usrfiles.com/ugd/b8c837_212961f804da471aad3fe6313697058a.pdf
    • https://static.usrfiles.com/ugd/b8c837_d04ec466c58b4e1fa7f83985518c6511.pdf
    • https://static.usrfiles.com/ugd/b8c837_d7d526a8d92843e3980dc44cb9cb89af.pdf
    • https://static.usrfiles.com/ugd/b8c837_aeba14b6879c43c8a61d852a8f1d1ae3.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_off0000bfcf.bin
39d520493529f0610cb0186a97ca2f78fa40ffa43c1d7029a9d35cdd65154089		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBFCF 5472 bytes
font_01_sfnt_off0000d23b.bin
e61ee58538cb26a156abe3bfea33e13185484ae464aa37184ab5c4d82553e5f7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD23B 10416 bytes

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