Malicious PDF — malware analysis report

Static analysis result for SHA-256 79de18196c6a18cf…

MALICIOUS

PDF

47.9 KB Created: 2020-07-09 03:22:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d467017e588acaf04f7febfc30fc7a12 SHA-1: 4cc90e6cf1590ecbde526f656f0b8f2f36a77a55 SHA-256: 79de18196c6a18cf7a771124de2204f038fed7329c1857854e3707295ac7d125
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, including one pointing to a known malicious redirector. The document body, though obfuscated, contains text related to payment agreements and the malicious URL, suggesting a phishing or scam attempt. The heuristic firings confirm the presence of malicious redirector links and a link farm, indicating an effort to drive traffic to potentially harmful sites.

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.ru/wb?keyword=letter%20of%20agreement%20for%20payment%20of%20debt%20pdf
    • http://files.agathafashion.shop/uploads/1/3/0/9/130969375/9654079.pdf
    • http://files.heraldinghistruthministries.com/uploads/1/3/0/7/130775131/7094126.pdf
    • http://files.kalaitzakisdesigns.com.au/uploads/1/3/1/3/131379789/bitagilotudoz_gujilixijew_tasopajorelakop_xomudobejev.pdf
    • http://files.laidlawlandscape.com/uploads/1/3/1/8/131857690/ronibagus.pdf
    • http://files.learnguitar4fun.com/uploads/1/3/1/8/131856381/8522082.pdf
    • http://files.breckenridgecoloradocondo.com/uploads/1/3/1/4/131408344/wexowitumep.pdf
    • http://files.julianoshea.com/uploads/1/3/1/4/131453807/jibumojexoje.pdf
    • http://files.teamingupforteens.org/uploads/1/3/2/6/132683088/1e507d14b84560.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://vefevomite.files.wordpress.com/2020/07/67251803595.pdf
    • https://xagixamowow.files.wordpress.com/2020/06/81246947379.pdf
    • https://fakesuni.files.wordpress.com/2020/07/30970351540.pdf
    • https://rawipetasiko.files.wordpress.com/2020/07/41264690392.pdf
    • https://nanesezup.files.wordpress.com/2020/06/lipetimofinupevexisi.pdf
    • https://jifikugi.files.wordpress.com/2020/07/napom.pdf
    • https://xukitivusapu.files.wordpress.com/2020/07/16851263873.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/44411244229.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/11783771814.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/juzopuzenafososokazulu.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/nojigepinipefonumupitos.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/47878122177.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/tefukina.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/ligumugazawebamupewav.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_off00007b78.bin
c09d53caf8d6f2d06e35e1d2415971615796ec00502a101d0f9633d17d2bfb99		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B78 5076 bytes
font_01_sfnt_off00008c9b.bin
8f279a2db8bb78a7d2fca0b933e4bd8091afaecbac455b5d0512e8919d9889fa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8C9B 11244 bytes

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