Malicious PDF — malware analysis report

Static analysis result for SHA-256 15bfbde51d00138e…

MALICIOUS

PDF

67.8 KB Created: 2020-07-18 21:19:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 88996eb6095e1e8368e9c783303957fd SHA-1: 1727d4382b43f5aff668030075a67a6c7f77082a SHA-256: 15bfbde51d00138e54fb1e7630c5b5b3676f06c67863c297d53798e9ef9acbf2
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one identified as a malicious redirector. The ML classifier strongly flagged this PDF as malicious. The document body, though heavily obfuscated, appears to be related to 'coal fired power plant process flow diagram pdf', suggesting a lure to disguise the malicious intent of redirecting users to potentially harmful websites.

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=coal%20fired%20power%20plant%20process%20flow%20diagram%20pdf
    • http://files.spilt-salt.com/uploads/1/3/0/7/130775828/916198.pdf
    • http://files.kymoversandmakers.com/uploads/1/3/1/3/131383467/2903792.pdf
    • http://files.mcyyang.com/uploads/1/3/1/8/131857916/9085229.pdf
    • http://files.shopqal.com/uploads/1/3/0/8/130813732/445206.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://fotifumiwo.files.wordpress.com/2020/06/wigimigatade.pdf
    • https://jakuwil.files.wordpress.com/2020/06/16471271598.pdf
    • https://jidiluda.files.wordpress.com/2020/06/95891308370.pdf
    • https://vamufif.files.wordpress.com/2020/07/16069093947.pdf
    • https://sajovuvinar.files.wordpress.com/2020/07/vosezosugixiwemasukijuki.pdf
    • https://jenunosij.files.wordpress.com/2020/06/79454869758.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/59022585862.pdf
    • https://cdn.shopify.com/s/files/1/0431/1705/2053/files/21169463537.pdf
    • https://cdn.shopify.com/s/files/1/0433/5511/1589/files/mitujalu.pdf
    • https://cdn.shopify.com/s/files/1/0427/7148/0742/files/zisaririnavofejotijod.pdf
    • https://cdn.shopify.com/s/files/1/0429/6726/9532/files/79014522416.pdf
    • https://cdn.shopify.com/s/files/1/0428/5205/7244/files/gululepa.pdf
    • https://cdn.shopify.com/s/files/1/0428/3334/6719/files/pakowiraxevuzoriberimat.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/gomejalubewetilukifij.pdf
    • https://cdn.shopify.com/s/files/1/0428/5802/1027/files/taxodajuloferowerakukelo.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_off0000c9b7.bin
7e0a1b3916fc19210e74f83d9f4389db74ee16ec867fe05d3c48f70c8f90e95e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC9B7 5376 bytes
font_01_sfnt_off0000dbfe.bin
6418e18fcd61d0efee74cd26a150dc9d33ed34962ffe9a0fcdaad3d704e31f0d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDBFE 11008 bytes

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