Malicious PDF — malware analysis report

Static analysis result for SHA-256 b000c59fd67f391f…

MALICIOUS

PDF

48.7 KB Created: 2020-08-30 15:53:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2751cfbfbb95cf9ad0f71c28fdade593 SHA-1: 5995f39fe9ce8fac2b70e85b5b4643ff80a3a5c2 SHA-256: b000c59fd67f391fd84e07ea2dc0460782b5c3c965906fe7ef1e9d7c64b4148b
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a high number of embedded links, with one specifically pointing to a known malicious redirector at 'ttraff.com'. The document body, though heavily obfuscated, contains the same malicious URL and references to 'Ansible command cheat sheet', suggesting a lure. The ML classifier strongly flagged this PDF as malicious, and the presence of numerous external links indicates a link farm or redirection strategy. No scripts were extracted, but the primary attack vector appears to be the malicious URL embedded within the document.

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=ansible+command+cheat+sheet
    • https://static.usrfiles.com/ugd/67e251_78e2ac501ffe49dc86d12d8687f241c0.pdf
    • https://static.usrfiles.com/ugd/345929_d1ddb0093a9249de82be6ed4e46bce5f.pdf
    • https://static.usrfiles.com/ugd/b8c837_d0f8ea63f4914060bdd63a13a00a6487.pdf
    • https://cdn.shopify.com/s/files/1/0431/5509/5712/files/96947694617.pdf
    • https://cdn.shopify.com/s/files/1/0435/0086/3643/files/abituriyent_7_jurnali.pdf
    • https://cdn.shopify.com/s/files/1/0440/3258/9989/files/provision_for_reinstatement_cost_annual_report.pdf
    • https://cdn.shopify.com/s/files/1/0435/1760/8090/files/arithmetic_and_geometric_sequence_formula.pdf
    • https://cdn.shopify.com/s/files/1/0436/1479/7981/files/67102644450.pdf
    • https://static.usrfiles.com/ugd/3e87bf_5b2a8f5a6bd449b98cf4d20a42d6a6a7.pdf
    • https://static.usrfiles.com/ugd/1be480_5353a2c24b804184b5bfc55a193df1af.pdf
    • https://static.usrfiles.com/ugd/4d6844_9c479bc83ffb4e8ca77e7eb02877bc08.pdf
    • https://static.usrfiles.com/ugd/d4a9d6_fe72b71d266c4530ae710b50b874a6fa.pdf
    • https://static.usrfiles.com/ugd/b8c837_dc5f95226f3348c890b8325eec20483f.pdf
    • https://cdn.shopify.com/s/files/1/0431/7511/6959/files/21192071392.pdf
    • https://cdn.shopify.com/s/files/1/0429/9125/5713/files/fafabupexi.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006707.bin
61b93956977f86eaa9a8a92d9e02c28db307c8f7068bc90abb89996a4a26da6d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6707 5000 bytes
font_01_sfnt_off000077c1.bin
d14596efda449023fb83069b33383d1c9396fa0126cd459601083cfe5b518e24		 pdf-font-stream PDF embedded font (sfnt) at offset 0x77C1 15412 bytes
font_02_sfnt_off0000a819.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA819 4324 bytes

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