Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d4df3a7ae88dda0…

MALICIOUS

PDF

43.5 KB Created: 2020-08-14 09:47:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f09276b8052d93fdbf4e98bafbc67f10 SHA-1: 94810eaa9ab22ab97feebc3939d3b93e66516fc8 SHA-256: 4d4df3a7ae88dda02f6e15a67a5bba5862cb7a62e588749d56d4a5dbb4bc72cc
152 Risk Score

Malware Insights

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

The PDF contains a mass external link farm, with many links pointing to shopify.com domains, likely for SEO manipulation. One critical heuristic identified a redirector link to 'ttraff.ru', which is known malicious infrastructure. The document body contains garbled text but also includes the malicious URL and several benign-looking PDF URLs, suggesting a lure to disguise the malicious redirect. No scripts were extracted from this sample.

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.ru/pify?keyword=broadsheet+best+new+restaurants+melbourne
    • http://files.richardmbailey.com/uploads/1/3/1/4/131410158/d8c2b04b.pdf
    • http://xipaxu.poplarbluffdancestudio.com/uploads/1/3/1/0/131069915/6a249d1c.pdf
    • http://lasejad.psvideography.com/uploads/1/3/0/8/130814328/256eddb6d3e04.pdf
    • http://pazutefeb.estherazar.com/uploads/1/3/2/6/132682663/8d09e066631bd7.pdf
    • http://files.campbellbarnescounseling.com/uploads/1/3/1/4/131406659/xedisiwun-mutaxapeve-wilopijib-redomume.pdf
    • https://cdn.shopify.com/s/files/1/0432/5857/7051/files/bacon_s_essay_of_truth.pdf
    • https://cdn.shopify.com/s/files/1/0440/1342/0702/files/20887796764.pdf
    • https://cdn.shopify.com/s/files/1/0429/5314/6517/files/futubidoziberofanime.pdf
    • https://cdn.shopify.com/s/files/1/0434/6930/8061/files/agama_islam_kelas_10.pdf
    • https://cdn.shopify.com/s/files/1/0428/3708/2271/files/viwubi.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/nazowexoratusitufunu.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/fesitoxerevujadutag.pdf
    • https://cdn.shopify.com/s/files/1/0429/7195/5351/files/casio_g_shock_5121_manual.pdf
    • https://cdn.shopify.com/s/files/1/0430/4191/5042/files/5831576972.pdf
    • https://cdn.shopify.com/s/files/1/0433/7713/1683/files/billing_system_project_documentation.pdf
    • https://cdn.shopify.com/s/files/1/0431/1715/0368/files/xuxozefimatu.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_off00006bb7.bin
f2bdb4f916c3fda6af7a95ab0155d161383eca48041603da81e11ade4d332b79		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6BB7 5344 bytes
font_01_sfnt_off00007dc4.bin
70574798938211b3e74234de23bc8409bd7ce3211bbcadaad7fd6b5eab43f9d6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7DC4 10252 bytes

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