Malicious PDF — malware analysis report

Static analysis result for SHA-256 401e2a72dfe9d5f4…

MALICIOUS

PDF

44.2 KB Created: 2020-08-15 15:42:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 048d0ac652248ac062fff9c7dd8ceb2f SHA-1: cf5334bc1f1942794c388a268a8f55d0263a0f06 SHA-256: 401e2a72dfe9d5f4a9cfc56dfe49a015a59b66daca54a62d091b980901a9c4a2
150 Risk Score

Malware Insights

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

The PDF contains a link that redirects to known malicious infrastructure, disguised as a piano tutorial. The PDF_MALICIOUS_REDIRECTOR_LINK heuristic firing confirms this. The embedded URLs and the ML classifier strongly indicate malicious intent. No scripts were extracted, but the primary attack vector appears to be a malicious redirector link.

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/wb?keyword=relax%20take%20it%20easy%20piano%20pdf
    • http://files.bostons4littlepaws.com/uploads/1/3/2/7/132740614/3838229.pdf
    • http://files.laurasmithauthor.com/uploads/1/3/0/8/130874284/9521626.pdf
    • http://files.justdupree.com/uploads/1/3/1/6/131607103/xubivuko.pdf
    • http://files.hornsbyptsa.org/uploads/1/3/1/3/131379434/bomujakurufilo.pdf
    • http://files.charliethewritingcoach.com/uploads/1/3/1/4/131437363/91d3f453dcafb.pdf
    • https://cdn.shopify.com/s/files/1/0431/5430/9284/files/68841794447.pdf
    • https://cdn.shopify.com/s/files/1/0438/6347/4331/files/lamegase.pdf
    • https://cdn.shopify.com/s/files/1/0431/5768/4375/files/arch_kde_install_guide.pdf
    • https://cdn.shopify.com/s/files/1/0431/5476/8032/files/wexatewanewakos.pdf
    • https://cdn.shopify.com/s/files/1/0427/9674/4871/files/170499327.pdf
    • https://cdn.shopify.com/s/files/1/0428/6346/0508/files/5000_watts_power_amplifier_circuit_diagram.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/pijajaza.pdf
    • https://cdn.shopify.com/s/files/1/0435/2029/5064/files/zosesevoleratusiva.pdf
    • https://cdn.shopify.com/s/files/1/0449/9764/0360/files/applied_operation_research.pdf
    • https://cdn.shopify.com/s/files/1/0435/5699/5233/files/23796386333.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005fe8.bin
4b243b2418f7003e0c8781b02436677ed95a67c91b46498b26aa3bae5bdd1b38		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5FE8 4968 bytes
font_01_sfnt_off000070eb.bin
e88aa5615b68070cc5fcf2215bc227b11cc997d0bdb83ed22d70b4b4a6a46dd0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x70EB 10760 bytes
font_02_sfnt_off000095a9.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x95A9 4324 bytes

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