Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f534679cc0e1bd8…

MALICIOUS

PDF

40.9 KB Created: 2020-07-21 09:46:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 23a0709a8fd1d527ebaadf8fce25c186 SHA-1: 71db360f7fa60e1111d2298f02faf4e7cdc5655c SHA-256: 6f534679cc0e1bd842d7cd4d01916edc9cf6226dc3360c5dbf433f0480f6f1d5
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing indicating it links to known malicious redirector infrastructure. It also exhibits a PDF link farm, suggesting a tactic to distribute malicious content or engage in SEO manipulation. The presence of embedded URLs and the ML classifier's high confidence further support a malicious classification. The document body, though heavily obfuscated, contains text related to 'metric space book pdf download', aligning with the lure of providing downloadable content.

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.cc/wb?keyword=metric%20space%20book%20pdf%20download
    • http://files.mskl313.com/uploads/1/3/1/4/131437064/eabd1.pdf
    • http://files.rottenrottie.com/uploads/1/3/1/3/131398380/c94c09f6fd.pdf
    • http://files.ghostwrittensomniloquy.com/uploads/1/3/1/6/131606035/tazotuwituzemuv.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/9472/1187/files/46915788491.pdf
    • https://cdn.shopify.com/s/files/1/0428/3075/8054/files/tujisikukusoj.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/87678197609.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/fisebupujavilugux.pdf
    • https://cdn.shopify.com/s/files/1/0435/8474/9725/files/bixiwinewaxevuzuxuxetaf.pdf
    • https://lalusonifuw.files.wordpress.com/2020/06/mamoxapi.pdf
    • https://jewifafubod.files.wordpress.com/2020/07/jobitojalume.pdf
    • https://segilojogezu.files.wordpress.com/2020/07/pezunigij.pdf
    • https://bisozupe.files.wordpress.com/2020/07/kupogegibekizufojitepixos.pdf
    • https://cdn.shopify.com/s/files/1/0437/7047/8746/files/romigetoralik.pdf
    • https://cdn.shopify.com/s/files/1/0433/0127/3750/files/60608065437.pdf
    • https://cdn.shopify.com/s/files/1/0433/9941/3925/files/52944194230.pdf
    • https://cdn.shopify.com/s/files/1/0428/4507/7660/files/newogabozinus.pdf
    • https://cdn.shopify.com/s/files/1/0427/4470/9276/files/nuzixupozasifulowixalu.pdf
    • https://cdn.shopify.com/s/files/1/0428/7542/0835/files/depimexipegurizowabowul.pdf
    • https://cdn.shopify.com/s/files/1/0436/5382/4677/files/69062702507.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_off00006204.bin
8012babfa14edb8aaaf8fdf9b4c47c3116f76b4e04328723956efad2f2025f5a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6204 5236 bytes
font_01_sfnt_off000073f4.bin
23032cf7bf7d0b0c7bffbdbb20ef12ef0e45e6f2e334a6bd9b9a0cdb9c2be0a0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x73F4 10140 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.