Malicious PDF — malware analysis report

Static analysis result for SHA-256 b14728aef78c2acb…

MALICIOUS

PDF

35.5 KB Created: 2020-09-06 16:50:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e952082f761e23ed983dde2411f83ddf SHA-1: 0c288c38a143b41562e08ec3a732690c3d5c1f80 SHA-256: b14728aef78c2acb4da96c8fdab7efd18ba0fb6991c9f6c4fd16f2864ce35f90
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to a URL that promises free Tamil movies. This link is embedded within the document body, which is heavily obfuscated but appears to contain the same URL and other links to PDF files hosted on Shopify. The ML classifier also strongly flagged this PDF as malicious. The primary attack vector is likely social engineering via a deceptive link.

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.club/wix?keyword=4k+movies++free+tamil
    • https://cdn.shopify.com/s/files/1/0430/1501/2511/files/fexirufiwozetuwesike.pdf
    • https://cdn.shopify.com/s/files/1/0430/6118/2617/files/buried_child_act_3.pdf
    • https://cdn.shopify.com/s/files/1/0437/7041/3207/files/29624476669.pdf
    • https://cdn.shopify.com/s/files/1/0435/6833/2968/files/david_harvey_brief_history_of_neoliberalism.pdf
    • https://cdn.shopify.com/s/files/1/0439/1036/5339/files/29715246821.pdf
    • https://static.usrfiles.com/ugd/c068f8_1cda49d75f084b96b9ae7160917bba5f.pdf
    • https://static.usrfiles.com/ugd/b8c837_770529f384cc46e985d680319b9a3c68.pdf
    • https://static.usrfiles.com/ugd/b7306e_8a6c27f659d24bc1b6d4b0be4b7bec84.pdf
    • https://cdn.shopify.com/s/files/1/0432/8914/9608/files/48890827972.pdf
    • https://cdn.shopify.com/s/files/1/0429/8542/2997/files/african_imperialism_dbq_answers.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_off00004cbc.bin
2837a1be1fab57b05097becf27c98e8ef93ffc990c386c511c198f8d6cd99c9d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4CBC 5032 bytes
font_01_sfnt_off00005dce.bin
4a0cdfb5e9a405945c856153cf9a0020ac6653c0db2f41fdcb6455e558e07799		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5DCE 10528 bytes

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