Malicious PDF — malware analysis report

Static analysis result for SHA-256 d41b05b04161e388…

MALICIOUS

PDF

47.0 KB Created: 2020-07-28 22:07:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cf74d0eb4c4424a22588c8b0d9174314 SHA-1: d126e7aaad6cbc1e3470f0bb0fa8bc7a208bcbd1 SHA-256: d41b05b04161e388fbc208ac79d6684343e1df21f3f8153ff192829be89f5c57
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure, specifically 'ttraff.cc'. Additionally, it exhibits a PDF link farm pattern, with numerous links pointing to Shopify-hosted PDFs, suggesting an attempt to manipulate search engine results or distribute malicious content. The ML classifier also strongly flagged this PDF as malicious.

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.cc/pify?keyword=android+games+free+.+best
    • http://files.softutor.com/uploads/1/3/0/7/130776401/3510741.pdf
    • http://files.klgdeehide.com/uploads/1/3/1/3/131398113/5766293.pdf
    • http://files.dia-healthcare.com/uploads/1/3/1/1/131164531/zewepuzojipefu-tozejuwujeriwu-wufojete-guzonudazo.pdf
    • https://cdn.shopify.com/s/files/1/0432/6418/0390/files/dulenilinoporumetafevoli.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/tedogunugovosilogupex.pdf
    • https://cdn.shopify.com/s/files/1/0434/6570/3590/files/61983008901.pdf
    • https://cdn.shopify.com/s/files/1/0431/0722/1658/files/dalunolu.pdf
    • https://cdn.shopify.com/s/files/1/0441/1126/5944/files/tibadibedoragi.pdf
    • https://cdn.shopify.com/s/files/1/0428/2603/9463/files/vufigabedof.pdf
    • https://cdn.shopify.com/s/files/1/0439/9045/0334/files/jusevidovajelunuri.pdf
    • https://cdn.shopify.com/s/files/1/0440/3098/4357/files/konisusu.pdf
    • https://cdn.shopify.com/s/files/1/0432/3033/1047/files/zafezojareromagotomu.pdf
    • https://cdn.shopify.com/s/files/1/0437/4904/8474/files/40883943203.pdf
    • https://cdn.shopify.com/s/files/1/0430/1009/7313/files/faxopefogugede.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_off00007bc0.bin
98fa28b1267e72892df601498feb1779cca4ba4cb4a65ddbc75d73feca56115c
pdf-font-stream PDF embedded font (sfnt) at offset 0x7BC0 5144 bytes
font_01_sfnt_off00008d22.bin
35f2c8c350e5f7ece266b8aec29656c755e0ad8c5acc2480e5ff119bde82d2cd
pdf-font-stream PDF embedded font (sfnt) at offset 0x8D22 9828 bytes