Malicious PDF — malware analysis report

Static analysis result for SHA-256 684016cc37d406e1…

MALICIOUS

PDF

41.8 KB Created: 2020-08-31 00:55:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fb2f9f5f91e066d2f9fa083fe9fdc18c SHA-1: 828c7f92b7d2cb3882050e93edb98a8aace302b0 SHA-256: 684016cc37d406e1f901af9a5667de195970525889c15f4de9428f2a9dfa87e9
162 Risk Score

Malware Insights

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

The PDF contains a link that redirects to malicious infrastructure, disguised as a movie download. The ML classifier strongly indicates maliciousness, and the presence of a download button lure reinforces the deceptive nature of the document. No scripts were extracted, but the embedded URL is the primary indicator of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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.ru/wix?keyword=ong+bak+3+english+full+movie+free+download
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/9494/1600/files/45917279193.pdf
    • https://cdn.shopify.com/s/files/1/0431/2160/6818/files/5339036612.pdf
    • https://cdn.shopify.com/s/files/1/0430/6383/6834/files/98981679747.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/ginowojero.pdf
    • https://cdn.shopify.com/s/files/1/0428/6735/9900/files/nupizulinimofujuk.pdf
    • https://cdn.shopify.com/s/files/1/0433/9020/6119/files/39067924904.pdf
    • https://cdn.shopify.com/s/files/1/0428/6211/7023/files/dsl_speed_test_reports.pdf
    • https://cdn.shopify.com/s/files/1/0434/0223/1971/files/31680029553.pdf
    • https://cdn.shopify.com/s/files/1/0434/7723/7913/files/nudabikafuxik.pdf
    • https://static.usrfiles.com/ugd/d216cb_8313cb7668f54868859d32c1842f69c8.pdf
    • https://static.usrfiles.com/ugd/cc14e4_adf3bcc0c26546a3b3774773a0ad7937.pdf
    • https://static.usrfiles.com/ugd/68ec51_121a29add8ea49e4a7313525aa65d22f.pdf
    • https://static.usrfiles.com/ugd/b8c837_2af84211bd3b42d4a2fc601104296d2d.pdf
    • https://static.usrfiles.com/ugd/934fc3_9deaf9c4306b44fea0fc71ba36a0d9dc.pdf
    • https://static.usrfiles.com/ugd/b8c837_3694562c2f81490580e07062b122b439.pdf
    • https://static.usrfiles.com/ugd/6a22cb_fa2dcec7cfa24ed88bd0c14d1f22520e.pdf
    • https://static.usrfiles.com/ugd/e73fea_b21e3b589bf842d29f515b1fda5d4d20.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_off000062d8.bin
f134ee4eb21c49a2cc1f0dd38011bff93ed96df6d10f581d2d6102259d346226		 pdf-font-stream PDF embedded font (sfnt) at offset 0x62D8 5868 bytes
font_01_sfnt_off000076b9.bin
79bafcee041433c97d48cda460cdcafca9d7c3d7e852892700359d05fbeabc00		 pdf-font-stream PDF embedded font (sfnt) at offset 0x76B9 10316 bytes

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