Malicious PDF — malware analysis report

Static analysis result for SHA-256 726490f2aa57c61a…

MALICIOUS

PDF

43.2 KB Created: 2020-08-31 13:47:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 21348b53a0f706d01f43d20a1e4d7e3f SHA-1: 1afd2dc2347af019f248833bc065a41bccfdfbd1 SHA-256: 726490f2aa57c61a05b4cc75951ba84f964ee9e3d52e0264cb8453f1d311da7c
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged as malicious by a machine learning classifier and contains a link to known malicious redirector infrastructure. It also features a large number of external links, suggesting a link farm or redirection attempt. The document body contains obfuscated text and URLs, reinforcing the malicious intent.

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/pify?keyword=vector+canape+17
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/4143/1464/files/26423501209.pdf
    • https://cdn.shopify.com/s/files/1/0430/1222/7225/files/59947227704.pdf
    • https://cdn.shopify.com/s/files/1/0440/7253/4166/files/kejalafuvipevog.pdf
    • https://cdn.shopify.com/s/files/1/0436/1791/0941/files/24024350018.pdf
    • https://static.usrfiles.com/ugd/b8c837_02f777f4841d4ffd9e5a9ee628ff5111.pdf
    • https://static.usrfiles.com/ugd/9e41f0_9af4f2ae1f56401a8bb0cbe7c3020545.pdf
    • https://static.usrfiles.com/ugd/b8c837_a322527bd40c4432be99b75aae917238.pdf
    • https://cdn.shopify.com/s/files/1/0431/3497/6157/files/zakadamuredikuzozona.pdf
    • https://cdn.shopify.com/s/files/1/0445/6477/5076/files/project_risk_management_download.pdf
    • https://cdn.shopify.com/s/files/1/0435/9222/0829/files/gitubuji.pdf
    • https://cdn.shopify.com/s/files/1/0428/4363/5879/files/88411030285.pdf
    • https://cdn.shopify.com/s/files/1/0432/8423/4398/files/c_generic_method.pdf
    • https://cdn.shopify.com/s/files/1/0434/3382/0322/files/revepepababuwimopik.pdf
    • https://cdn.shopify.com/s/files/1/0428/9314/8313/files/niyoti_bengali_movie_video_song.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_off00006441.bin
ec49fa81a0b742ced6f174d871d7713bea3b4b1eb913428e3ebea54433a3c684
pdf-font-stream PDF embedded font (sfnt) at offset 0x6441 4816 bytes
font_01_sfnt_off000074c7.bin
c0a41e73f9166d0bb945e2363c9dbd4f40490e0da44e88d1a29d616d585186d2
pdf-font-stream PDF embedded font (sfnt) at offset 0x74C7 13776 bytes