Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4fa3a7f516a7380…

MALICIOUS

PDF

40.2 KB Created: 2020-08-17 10:39:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9f346e301e34c9fe4e25a5ad2777c4ba SHA-1: bd5b00be5b7fc2dc5a22150b131f507832fde4a0 SHA-256: d4fa3a7f516a7380d48dcad35346425448c1af552267e40b1929e602bc3bc437
150 Risk Score

Malware Insights

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

The PDF contains numerous links, with one specifically pointing to a known malicious redirector. The document body, though heavily obfuscated, contains the string 'paper bag template a3' and the malicious URL, suggesting a lure to a phishing or scam site. The presence of a link farm and a high ML classifier score further support malicious intent.

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/pify?keyword=paper+bag+template+a3
    • http://gaxedok.magicalmatthew.com/uploads/1/3/1/4/131407057/b4bf77a179b4fdd.pdf
    • http://kemivu.susanweisz.com/uploads/1/3/1/3/131384171/9804259.pdf
    • http://files.netflixhomeacc1.com/uploads/1/3/1/0/131069824/67a20.pdf
    • http://files.walkercateringco.ca/uploads/1/3/1/3/131383541/78744.pdf
    • https://cdn.shopify.com/s/files/1/0436/9294/9658/files/nuclear_waste_management_methods.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/67572949107.pdf
    • https://cdn.shopify.com/s/files/1/0437/5629/0206/files/characteristics_of_a_project_report_writing.pdf
    • https://cdn.shopify.com/s/files/1/0433/5216/2462/files/goxoxemeduzipukujiwife.pdf
    • https://cdn.shopify.com/s/files/1/0432/1778/0896/files/32515630977.pdf
    • https://cdn.shopify.com/s/files/1/0437/8561/7570/files/7665524133.pdf
    • https://cdn.shopify.com/s/files/1/0434/9470/3270/files/swash_plate_pump.pdf
    • https://cdn.shopify.com/s/files/1/0447/7750/4925/files/marti_michell_drunkard_s_path_templates.pdf
    • https://cdn.shopify.com/s/files/1/0433/9033/7182/files/27587753907.pdf
    • https://cdn.shopify.com/s/files/1/0435/4280/6680/files/lozub.pdf
    • https://cdn.shopify.com/s/files/1/0434/7222/4421/files/91776880683.pdf
    • https://cdn.shopify.com/s/files/1/0430/8146/6005/files/51359713760.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_off00006075.bin
7e240e4aa512f58dc6fb99a0908a2d8be0eb9950ebc0a368fd0e41f4fc313206		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6075 5268 bytes
font_01_sfnt_off0000724c.bin
04b11838a06ef600be996c02aba1f394d8007feab37d7184dd11056739bf5042		 pdf-font-stream PDF embedded font (sfnt) at offset 0x724C 9924 bytes

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