Malicious PDF — malware analysis report

Static analysis result for SHA-256 15384300f2afe728…

MALICIOUS

PDF

41.9 KB Created: 2020-09-03 02:10:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 50ece3f36f6a12c74af130e048f986ef SHA-1: 93c4abd5e109cc888ffa9eb73fa1d3628b9fbd33 SHA-256: 15384300f2afe728e1e14b0edf24a59b116553b4cda5f8a1c933a430177139b1
154 Risk Score

Malware Insights

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

The PDF contains embedded links, one of which, 'https://ttraff.com/wix?keyword=assembly+language+programming+8051+examples+pdf', is flagged as a malicious redirector. The document also exhibits characteristics of a link farm, with numerous external PDF links, suggesting an attempt to drive traffic to potentially malicious or SEO-spam content. The ML classifier strongly indicates maliciousness.

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/wix?keyword=assembly+language+programming+8051+examples+pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/3015/0309/files/bifigoxedodakitutoxem.pdf
    • https://cdn.shopify.com/s/files/1/0429/5757/0207/files/aging_society_thailand.pdf
    • https://cdn.shopify.com/s/files/1/0435/7832/7199/files/82540993434.pdf
    • https://cdn.shopify.com/s/files/1/0432/2125/4312/files/86369928499.pdf
    • https://cdn.shopify.com/s/files/1/0463/0839/3122/files/1751014406.pdf
    • https://cdn.shopify.com/s/files/1/0428/8059/8172/files/javascript_sum_array_of_objects.pdf
    • https://cdn.shopify.com/s/files/1/0428/4488/1062/files/cara_video_facebook_pc.pdf
    • https://cdn.shopify.com/s/files/1/0429/8784/7843/files/ragijurevibobinejodos.pdf
    • https://cdn.shopify.com/s/files/1/0440/0427/8422/files/started_unicast_maintenance_ranging.pdf
    • https://static.usrfiles.com/ugd/3f80ec_baf67c1cf0e7476298671a00e8127afe.pdf
    • https://static.usrfiles.com/ugd/43d598_9694a950203a4e6fa3d47dbcd32a3ece.pdf
    • https://static.usrfiles.com/ugd/1e11d0_bd34c6a4928049cb9dc397a96cf2d5e1.pdf
    • https://static.usrfiles.com/ugd/5926b4_4c809505d55b4dfd88dd9dfadb8f5ec2.pdf
    • https://static.usrfiles.com/ugd/e481ce_25d6a66ce0ed4c2ba86bc989209669f6.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000062e9.bin
c33099a0b99e6889da216f0753469cdbf80787499d78ab2ce5bcc229bc44a22f
pdf-font-stream PDF embedded font (sfnt) at offset 0x62E9 6172 bytes
font_01_sfnt_off000077e1.bin
bf0aeac8c4a692d86b4554101844980fea8a0c4ada4bd359305125a743a4dcde
pdf-font-stream PDF embedded font (sfnt) at offset 0x77E1 10192 bytes