Malicious PDF — malware analysis report

Static analysis result for SHA-256 79fb996b5f4213b4…

MALICIOUS

PDF

50.5 KB Created: 2020-07-26 04:31:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 10c4feb30c1a27e823e14683efc393b0 SHA-1: 00143b9d41f664ecacac26fb18839eb2d0971232 SHA-256: 79fb996b5f4213b45278b833bbbbf844a4c4a7348e376048c3796242754d814c
154 Risk Score

Malware Insights

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

The PDF contains numerous links, with one pointing to a known malicious redirector. The document body, though heavily obfuscated, suggests a lure related to 'plot diagram worksheet answers'. The presence of many external PDF links, some benign and some unknown, indicates a potential link farm or distribution mechanism. No scripts were extracted, but the heuristic firings strongly suggest malicious intent via redirection.

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/wb?keyword=plot%20diagram%20worksheet%20answers
    • http://files.monroesportsmansclub.com/uploads/1/3/1/8/131856041/lotoruxezol.pdf
    • http://files.gentlemencallers.com/uploads/1/3/2/7/132740637/tiduba.pdf
    • http://files.glasgowfeministartsfestival.com/uploads/1/3/0/8/130813616/wexarix_kedetupo_nivafupomuxutoz_vufafuzafapikal.pdf
    • http://files.historicwestheight.org/uploads/1/3/0/9/130969364/cc4bc008.pdf
    • http://files.oldzionwesleyan.com/uploads/1/3/1/4/131452903/xigefix.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0437/3394/2426/files/32125599073.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/94215193789.pdf
    • https://cdn.shopify.com/s/files/1/0441/1781/9544/files/39964262682.pdf
    • https://cdn.shopify.com/s/files/1/0437/7051/1521/files/nokaxa.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/puxatofutedixa.pdf
    • https://cdn.shopify.com/s/files/1/0437/0612/2393/files/99008689516.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/15843942414.pdf
    • https://cdn.shopify.com/s/files/1/0432/0441/1556/files/83007021219.pdf
    • https://cdn.shopify.com/s/files/1/0438/0891/5613/files/48298274632.pdf
    • https://cdn.shopify.com/s/files/1/0431/1184/1958/files/51601606107.pdf
    • https://cdn.shopify.com/s/files/1/0437/6271/2734/files/rezilexosed.pdf
    • https://cdn.shopify.com/s/files/1/0432/4743/5940/files/96521212541.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_off000088a5.bin
241e6fd1a7792d363cfb99864920cf882879306765e9c3d130f219e9c8b12063		 pdf-font-stream PDF embedded font (sfnt) at offset 0x88A5 5184 bytes
font_01_sfnt_off00009a25.bin
b90b0c252153f247099e996f179cc93ae4778ea26620ae0bfd536f39ec55516f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9A25 10148 bytes

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