Malicious PDF — malware analysis report

Static analysis result for SHA-256 b70639f84330821b…

MALICIOUS

PDF

40.4 KB Created: 2020-08-07 19:40:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c13310f44f94631d0031ea61b915ddde SHA-1: 34298c9e9ede4a1d15b8d18846f2ef29296be874 SHA-256: b70639f84330821b9391058021ba78f7503c5af677fd5369e93407504f654b7e
150 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to Shopify domains, but one critical link redirects to a known malicious infrastructure at 'ttraff.cc'. This suggests a link farm or redirection tactic to obscure the final malicious destination. The document body, though heavily obfuscated, contains the URL 'https://ttraff.cc/pify?keyword=co+branding+guidelines+pdf', reinforcing the malicious redirector finding. The ML classifier also strongly indicated maliciousness.

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/pify?keyword=co+branding+guidelines+pdf
    • http://files.themadbarron.com/uploads/1/3/0/7/130775728/wotawanuwipe-nolorozaf-gegelo-tapisawa.pdf
    • http://files.montellotastingroom.com/uploads/1/3/0/8/130874457/fulikalijagotug.pdf
    • http://files.moyo-up.de/uploads/1/3/1/0/131070367/114237.pdf
    • http://rajep.elkhornvalleydistrict.org/uploads/1/3/2/8/132816202/sijokumo.pdf
    • https://cdn.shopify.com/s/files/1/0432/3901/4562/files/duck_life_3.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/15636630427.pdf
    • https://cdn.shopify.com/s/files/1/0434/2602/1527/files/mobonazibozup.pdf
    • https://cdn.shopify.com/s/files/1/0433/7578/8184/files/snowball_warren_buffett.pdf
    • https://cdn.shopify.com/s/files/1/0432/8249/7701/files/49525022928.pdf
    • https://cdn.shopify.com/s/files/1/0440/1076/6486/files/alternating_current_circuits_by_ky_tang.pdf
    • https://cdn.shopify.com/s/files/1/0430/4447/0945/files/11228270549.pdf
    • https://cdn.shopify.com/s/files/1/0437/4190/5057/files/eager_beaver_2._0_chainsaw_manual.pdf
    • https://cdn.shopify.com/s/files/1/0430/9617/8849/files/45833504178.pdf
    • https://cdn.shopify.com/s/files/1/0431/9825/1165/files/55953353493.pdf
    • https://cdn.shopify.com/s/files/1/0432/0568/9504/files/8593566137.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_off0000616b.bin
561ed16b3aa581462deed18966367d104d097a41e278cae921f278dbab9c9c3f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x616B 5256 bytes
font_01_sfnt_off0000734c.bin
18834331cb56e5de68f8797994e9ca1ee905d42d94d04b84784bb5a7fb8a3073		 pdf-font-stream PDF embedded font (sfnt) at offset 0x734C 9892 bytes

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