Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa6b7bd2440414b6…

MALICIOUS

PDF

46.8 KB Created: 2020-09-01 04:43:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a7b6b1b8972f39e9ff3ad89dce604f24 SHA-1: 2c4f9cc12604d5a23c62107a71409ec9ef977652 SHA-256: aa6b7bd2440414b66d0be4163ffb14fad969e5afdea5c1430e0f7b76c65efc76
150 Risk Score

Malware Insights

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

The PDF document was flagged by multiple critical heuristics for containing malicious redirector links and a large number of external PDF links, suggesting a link farm. One of the primary links directs to 'ttraff.cc', which is identified as known malicious infrastructure. The document body contains obfuscated text and a URL that appears to be the primary lure. No scripts were extracted from this sample.

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=church+recommendation+letter+template
    • https://cdn.shopify.com/s/files/1/0432/5389/1232/files/spongebob_credits_song.pdf
    • https://cdn.shopify.com/s/files/1/0437/8984/4641/files/kukumejusi.pdf
    • https://cdn.shopify.com/s/files/1/0437/5258/7415/files/gijokazibazoronabaga.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/95181885481.pdf
    • https://cdn.shopify.com/s/files/1/0433/5458/7295/files/learn_spanish_wikibooks.pdf
    • https://cdn.shopify.com/s/files/1/0432/2174/5823/files/24843044755.pdf
    • https://cdn.shopify.com/s/files/1/0439/6508/7902/files/jiwidasipun.pdf
    • https://cdn.shopify.com/s/files/1/0430/6246/0577/files/fiwuvedasitu.pdf
    • https://cdn.shopify.com/s/files/1/0438/5308/6885/files/verb_to_be_affirmative_and_negative_exercises.pdf
    • https://static.usrfiles.com/ugd/e2b09b_3aafc7bb461b4d71a68379c8eabf3b0c.pdf
    • https://static.usrfiles.com/ugd/b8c837_464e5ac5559d42a2a350eb3a5e43b3a4.pdf
    • https://static.usrfiles.com/ugd/1a89c8_9bab21119836486bbc3cc13737331369.pdf
    • https://static.usrfiles.com/ugd/b8c837_54ca766becbf4c6a875aafae1caee49b.pdf
    • https://static.usrfiles.com/ugd/2c8d66_b956ab532ec542e5a670185d1c173175.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_off00007b62.bin
e45c4bc1909be444638522c6a8dcab2f24bf3823c1fe16cf07aa1f039f663725		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B62 5040 bytes
font_01_sfnt_off00008c4c.bin
421676d88dc2dccc80fd5941ba3ceb08dbe6dcb8ad8a96d8e7050030709fa8ce		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8C4C 9976 bytes

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