Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e231d191da6d305…

MALICIOUS

PDF

39.3 KB Created: 2020-08-09 20:40:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dd68b19f7093e63d3c2b5d7622d0047a SHA-1: 422f309a2e46492f49d6fbc21dfb27e1c3af3cfa SHA-256: 5e231d191da6d3055399b8d3062f2a3b14f4ae912068c3dce19ba1d36dd48248
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link to a known malicious redirector infrastructure, suggesting an attempt to lead the user to a malicious site. It also exhibits characteristics of a link farm, embedding numerous external links, many of which point to benign Shopify URLs but one critical link leads to a malicious redirector. The ML classifier strongly indicates maliciousness, and the document body, though heavily obfuscated, contains the suspicious URL.

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/pify?keyword=boss+me+25+patches+pdf
    • http://xofizeri.joyfulsoundchoir.org/uploads/1/3/0/7/130739024/vokexifuxa-kinowafi-mawizagege-tasegenojag.pdf
    • http://files.centralvalleypure.com/uploads/1/3/0/7/130738762/nanorugili.pdf
    • http://soziwopu.kristivandenboschgis.com/uploads/1/3/1/3/131380005/8525336.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0429/5265/5004/files/caballeros_templarios_gratis.pdf
    • https://cdn.shopify.com/s/files/1/0429/6772/8279/files/xixowajugezi.pdf
    • https://cdn.shopify.com/s/files/1/0434/6285/2761/files/clorox_bleach_msds.pdf
    • https://cdn.shopify.com/s/files/1/0430/6056/0025/files/25060148283.pdf
    • https://cdn.shopify.com/s/files/1/0437/0196/0854/files/90720502951.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/siwizobudavegi.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/15636630427.pdf
    • https://cdn.shopify.com/s/files/1/0428/1935/4791/files/gadisejifubekuzi.pdf
    • https://cdn.shopify.com/s/files/1/0432/9019/8180/files/kawanedisuragiloje.pdf
    • https://cdn.shopify.com/s/files/1/0437/2014/7095/files/kaman.pdf
    • https://cdn.shopify.com/s/files/1/0434/3437/7377/files/academic_writing_book_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0435/3762/9348/files/44209916630.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004e0a.bin
0168d2161e345ac36774c9dad22d4c6c38da69c25d8db1b6da24c8e74fd6738e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4E0A 5208 bytes
font_01_sfnt_off00005fc3.bin
f7e08528947e171a16cfd9c9d4e03a5f80769554c676ef2e0c596616b2653b8e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5FC3 10096 bytes
font_02_sfnt_off0000826a.bin
ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230		 pdf-font-stream PDF embedded font (sfnt) at offset 0x826A 4324 bytes

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