Malicious PDF — malware analysis report

Static analysis result for SHA-256 8215211e55991a74…

MALICIOUS

PDF

45.9 KB Created: 2020-08-18 21:57:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0f497c2e079e6ed90ee01d2eb024a786 SHA-1: 1f52370ca89024226c3f05e1b036af24cd63e820 SHA-256: 8215211e55991a7455f06143d1f52d504acc0a5155450ac6fcbc299f7073c31e
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded links that point to a redirector service known for malicious activity. The document body, though partially corrupted, contains text related to 'pc games' and a URL that aligns with the malicious redirector. The presence of numerous external PDF links, many hosted on Shopify, suggests a link farm designed to distribute malicious content or improve SEO for malicious sites. No scripts were extracted, but the PDF structure itself facilitates the malicious redirection.

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.com/pify?keyword=pc+games+64mb+video+card+free
    • http://files.spiritblossomspsychics.com/uploads/1/3/1/1/131164250/tapan.pdf
    • http://seduwaf.apply-me.com/uploads/1/3/1/3/131379182/wepowidu_kumejedapuvo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0431/6846/5053/files/worinum.pdf
    • https://cdn.shopify.com/s/files/1/0433/0654/9406/files/23046889127.pdf
    • https://cdn.shopify.com/s/files/1/0430/6776/8981/files/jabovaziveg.pdf
    • https://cdn.shopify.com/s/files/1/0428/5467/8687/files/antiepileptic_drug_interactions.pdf
    • https://cdn.shopify.com/s/files/1/0431/4667/4330/files/solid_waste_management_articles.pdf
    • https://cdn.shopify.com/s/files/1/0434/7016/0032/files/coriolis_acceleration_derivation.pdf
    • https://cdn.shopify.com/s/files/1/0434/0842/5123/files/rapofujovevufofipavo.pdf
    • https://cdn.shopify.com/s/files/1/0428/9436/0743/files/30362876661.pdf
    • https://cdn.shopify.com/s/files/1/0433/4141/4568/files/physical_science_high_school.pdf
    • https://cdn.shopify.com/s/files/1/0434/4040/6695/files/assessment_for_learning_tamil_book.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/wonazonuv.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000066b5.bin
601fa493f59a2506f1eb83d65765750444b355940229cb1a0917f06bc9c27dbf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x66B5 5356 bytes
font_01_sfnt_off000078ea.bin
23310a8be42c08bf5f85677ef2f5a50fd3cf6065cd578fa88d3efd0646808943		 pdf-font-stream PDF embedded font (sfnt) at offset 0x78EA 10528 bytes
font_02_sfnt_off00009ce5.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9CE5 4324 bytes

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