Malicious PDF — malware analysis report

Static analysis result for SHA-256 5081a3460b1cda0c…

MALICIOUS

PDF

36.3 KB Created: 2020-08-08 21:00:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0211a65953ccf8a3fc2b8169393b1c71 SHA-1: bdd859400c37c936b90c197b8caa0a0091844591 SHA-256: 5081a3460b1cda0c18bd52184d142d2937c05a5057cd42e03f1f623924127a6c
150 Risk Score

Malware Insights

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

The PDF contains a link farm designed to mimic search results for a textbook, with the primary link redirecting to known malicious infrastructure. The ML classifier strongly indicated maliciousness, and the PDF structure suggests a lure to a malicious redirector. No scripts were extracted, limiting the analysis of direct payload execution.

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=carranza+s+clinical+periodontology+10th+edition+pdf
    • http://files.jesselgallery.com/uploads/1/3/0/7/130776082/famuwunazivaso_suvutuwu_noxaxodujipuroz_ferotog.pdf
    • http://files.seniorcenterwalkercounty.com/uploads/1/3/1/3/131380600/kusixisufidi.pdf
    • http://simolagu.gooseberrycakeco.com.au/uploads/1/3/0/8/130814297/tevafukizisosowe.pdf
    • https://cdn.shopify.com/s/files/1/0437/0428/7383/files/empirical_formula_worksheet_2_answers.pdf
    • https://cdn.shopify.com/s/files/1/0435/0109/3030/files/digil.pdf
    • https://cdn.shopify.com/s/files/1/0434/0898/2165/files/zipujuruliluxetafo.pdf
    • https://cdn.shopify.com/s/files/1/0434/9716/0866/files/60869330212.pdf
    • https://cdn.shopify.com/s/files/1/0437/1991/7720/files/zuruwugifubivuv.pdf
    • https://cdn.shopify.com/s/files/1/0430/7088/1946/files/83957670117.pdf
    • https://cdn.shopify.com/s/files/1/0429/6579/4965/files/nutapatatinegojatalaj.pdf
    • https://cdn.shopify.com/s/files/1/0427/9032/2342/files/58260591889.pdf
    • https://cdn.shopify.com/s/files/1/0434/1858/3192/files/4261759399.pdf
    • https://cdn.shopify.com/s/files/1/0440/1666/4734/files/84316977845.pdf
    • https://cdn.shopify.com/s/files/1/0430/9755/5093/files/drivers_license_renewal_texas.pdf
    • https://cdn.shopify.com/s/files/1/0435/1416/7450/files/42757988207.pdf
    • https://cdn.shopify.com/s/files/1/0440/0444/2262/files/catholic_liturgical_vestments.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_off00004e71.bin
9f324c8a072cb0696cbe0bd8b3e3cfc46ea7ea9fec225893ce93f5280b6c8fb3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4E71 5668 bytes
font_01_sfnt_off000061cb.bin
94c4d6c940f13eac578a7ebf68138e6bb2b41cc606991e7f4620aaa1cdb271b3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x61CB 10072 bytes

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