Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f0065477923f7d8…

MALICIOUS

PDF

41.3 KB Created: 2020-08-31 06:27:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1bf25e86583f151a38949951eec09222 SHA-1: 75d20de76713188f8524b2c93a1c4cfd61d35f35 SHA-256: 8f0065477923f7d8a93eafec11c8a1051c3319e1cd17337dabb26e5711b00c95
152 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by a machine learning classifier and contains a large number of embedded links. One of these links, https://ttraff.cc/wix?keyword=business+math+formulas, points to a known malicious redirector. The document's structure suggests it is designed to host a link farm, likely to distribute malicious content or facilitate phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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=business+math+formulas
    • https://cdn.shopify.com/s/files/1/0431/1072/7842/files/wisowogapusokojoga.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/volobufepafolosovi.pdf
    • https://cdn.shopify.com/s/files/1/0437/8161/9861/files/variance_analysis_actual_vs_budget_with_explanation.pdf
    • https://cdn.shopify.com/s/files/1/0436/6237/7113/files/34070737916.pdf
    • https://cdn.shopify.com/s/files/1/0435/4631/2863/files/13187297058.pdf
    • https://static.usrfiles.com/ugd/cfbfd2_aec250eb07824c0599152db63e835f3b.pdf
    • https://static.usrfiles.com/ugd/de3d83_18499973ffae4a3783f9c1a10d77b758.pdf
    • https://static.usrfiles.com/ugd/8b49c6_5caf4729d8da41ea8f20858fea17242b.pdf
    • https://static.usrfiles.com/ugd/a64c8c_44e91e0804234214be9994c9f2eace21.pdf
    • https://static.usrfiles.com/ugd/c0fca2_701233cfc58e4c04b0aab56f0adfbd2f.pdf
    • https://static.usrfiles.com/ugd/f65175_d56bbb403f6349a4ac2ae7d890d4929f.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_off0000642a.bin
d44dda070635656dbff3c4862f84fa9704c80b8f70cf931e3479d4dd673a48b0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x642A 5056 bytes
font_01_sfnt_off00007521.bin
6664ad386292bbabe8b26ad333939839f4a64fc0eb25f1161fbc890565e18405		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7521 10472 bytes

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