Malicious PDF — malware analysis report

Static analysis result for SHA-256 67551b8d3aa8f7b6…

MALICIOUS

PDF

46.7 KB Created: 2020-07-13 21:58:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e7c27f3c796eca45ad3bace7abb3fc16 SHA-1: dc6cf41f47bb0a0cfde7335daef6152d834a6659 SHA-256: 67551b8d3aa8f7b6deb628c5560720867dce65527e07ac152f1f30e9de4428c9
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a significant number of embedded links, with one heuristic specifically identifying it as a PDF SEO link farm. Another critical heuristic indicates a link to known malicious redirector infrastructure. The ML classifier also strongly flagged this PDF as malicious. The embedded document body text appears to be garbled and likely not intended for human consumption, suggesting the primary purpose is link distribution.

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=ethical%20behavior%20in%20business%20pdf
    • http://files.harrisburghigh.org/uploads/1/3/1/3/131379371/d7ff44.pdf
    • http://files.michiganmidwife.com/uploads/1/3/1/8/131856133/6132557.pdf
    • http://files.joysanchezphotography.com/uploads/1/3/1/4/131437699/776255.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://xokiwija.files.wordpress.com/2020/07/sabidujoxavoru.pdf
    • https://vikezepe379027054.files.wordpress.com/2020/06/32668153299.pdf
    • https://muwiful.files.wordpress.com/2020/06/metibe.pdf
    • https://bisogupawike.files.wordpress.com/2020/06/26269905324.pdf
    • https://jebopija.files.wordpress.com/2020/07/38015768230.pdf
    • https://xupezuvu.files.wordpress.com/2020/06/dabunegawado.pdf
    • https://goxapexuti.files.wordpress.com/2020/07/mubumobakemevifu.pdf
    • https://divasojawi.files.wordpress.com/2020/06/niveb.pdf
    • https://cdn.shopify.com/s/files/1/0431/6826/8456/files/73068788715.pdf
    • https://cdn.shopify.com/s/files/1/0433/0268/2789/files/13252861124.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/pigirerunozekolufis.pdf
    • https://cdn.shopify.com/s/files/1/0433/4573/9941/files/82654441847.pdf
    • https://cdn.shopify.com/s/files/1/0431/2491/6388/files/mubowovunepurepagupe.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/tekutuni.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/65233410578.pdf
    • https://cdn.shopify.com/s/files/1/0431/0827/0244/files/8784695288.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/nitupalakisotubawu.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_off000078b6.bin
830361e0283eab9baa6f0500355b90135a14e698aee13c8791c56f047611fbd0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x78B6 5284 bytes
font_01_sfnt_off00008a97.bin
fe00a419f3a4e00d50ce900f64da6587217523dd39c15a410e3ff519c702fa36		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8A97 10204 bytes

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