Malicious PDF — malware analysis report

Static analysis result for SHA-256 3bf1eb1341b10442…

MALICIOUS

PDF

45.1 KB Created: 2020-08-30 07:46:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c73137ee577578041a86f7331d9c7eda SHA-1: e9a263435fcbcc8b4a3628f3cde67be32f034f99 SHA-256: 3bf1eb1341b10442bcab8915e8cd9dcaea90af39b70568b81ec816efedec53db
152 Risk Score

Malware Insights

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

The PDF file contains embedded links that point to a redirector URL, which is a known malicious infrastructure. The document body, though heavily obfuscated, appears to be a lure related to an 'ecology reinforcement and study guide answer key'. The presence of a large number of external PDF links, many hosted on cdn.shopify.com, suggests a link farm designed to obscure the true malicious destination.

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/wix?keyword=principles+of+ecology+reinforcement+and+study+guide+answer+key
    • https://cdn.shopify.com/s/files/1/0429/9486/0191/files/envision_math_common_core_grade_5.pdf
    • https://cdn.shopify.com/s/files/1/0430/1737/1797/files/bollywood_songs_ming_2018.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/mojarugalemidim.pdf
    • https://cdn.shopify.com/s/files/1/0435/4621/4564/files/26874650251.pdf
    • https://cdn.shopify.com/s/files/1/0428/9557/3158/files/xopokobazofo.pdf
    • https://cdn.shopify.com/s/files/1/0437/0844/8922/files/kubepejonuzug.pdf
    • https://cdn.shopify.com/s/files/1/0431/1249/7312/files/avengers_wallpaper_hd_4k_for_pc.pdf
    • https://cdn.shopify.com/s/files/1/0436/9675/0742/files/adhe_kangal_old_tamil_movie_free.pdf
    • https://cdn.shopify.com/s/files/1/0440/6624/2710/files/gokegidop.pdf
    • https://cdn.shopify.com/s/files/1/0432/0192/1184/files/xafurejisoxabewefijema.pdf
    • https://cdn.shopify.com/s/files/1/0427/6197/8023/files/54391246584.pdf
    • https://cdn.shopify.com/s/files/1/0437/3974/2359/files/45006738562.pdf
    • https://cdn.shopify.com/s/files/1/0431/0525/5577/files/51198284361.pdf
    • https://cdn.shopify.com/s/files/1/0435/2029/5064/files/5851984223.pdf
    • https://cdn.shopify.com/s/files/1/0428/3046/3135/files/the_amory_wars_ultimate_edition.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006f47.bin
2ea08c54956dec143b677fdab80dac42d19bf1c1cac578774a58ca8986439cda
pdf-font-stream PDF embedded font (sfnt) at offset 0x6F47 5732 bytes
font_01_sfnt_off000082c5.bin
5a73f29281ac4f8441fb090cf78feb6244c47142da4a9f827f9e15044ab83a3e
pdf-font-stream PDF embedded font (sfnt) at offset 0x82C5 10772 bytes