Malicious PDF — malware analysis report

Static analysis result for SHA-256 4da97b530f967864…

MALICIOUS

PDF

45.2 KB Created: 2020-09-02 20:49:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 31dced3c328a1676a26c9ebcaeea3ef5 SHA-1: ed2568816d8b2aa15648af8bf29d71c251403c27 SHA-256: 4da97b530f967864dda130285e25c3ca922b69eb07d5d8c5730a531a8266b262
152 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and contains numerous embedded links, including a known malicious redirector. The heuristic PDF_SEO_LINK_FARM indicates a link farm with 28 external PDF links, suggesting an attempt to manipulate search engine results or distribute further malicious content. The primary malicious URL identified is https://ttraff.link/wix?keyword=kruskal+wallis+test+reporting+apa.

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.link/wix?keyword=kruskal+wallis+test+reporting+apa
    • https://static.usrfiles.com/ugd/e5412a_c40ac9b97d0c48d486a97e3ca3a54d34.pdf
    • https://static.usrfiles.com/ugd/12dc78_c13be8322bac4129ab84f843a6dc26a4.pdf
    • https://static.usrfiles.com/ugd/51c472_9a4a401a055d40c98b16bffff4f6c1bd.pdf
    • https://static.usrfiles.com/ugd/122077_ad902fd9b54446b3a6f89da5331e03fe.pdf
    • https://static.usrfiles.com/ugd/191a6d_669312e800634b7f905d3e7c3dbe60db.pdf
    • https://cdn.shopify.com/s/files/1/0429/4000/6559/files/vimalamukitikot.pdf
    • https://cdn.shopify.com/s/files/1/0432/2400/6823/files/biology_class_11_chapter_2_notes.pdf
    • https://cdn.shopify.com/s/files/1/0433/3387/7915/files/charity_and_andres_duels_full_performance.pdf
    • https://cdn.shopify.com/s/files/1/0433/0084/7780/files/vukisixe.pdf
    • https://static.usrfiles.com/ugd/99a8f2_b0489ac642444b1daa1541ea9af02464.pdf
    • https://static.usrfiles.com/ugd/b8c837_3c5f368928b049d584ceedda96fac2e1.pdf
    • https://static.usrfiles.com/ugd/b8c837_13904c4f41c241c282d43c591d4faf7b.pdf
    • https://static.usrfiles.com/ugd/1be480_6c74caed53624b6d91b8ff2f964a0428.pdf
    • https://static.usrfiles.com/ugd/b8c837_64a79ded2e114481a1cf6f2342f89e14.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_off0000734d.bin
529d71b4cba04f5205b1cf12cf7cc23e5a3771f4ffd8db6dde3d9b0176b9f562
pdf-font-stream PDF embedded font (sfnt) at offset 0x734D 5112 bytes
font_01_sfnt_off000084da.bin
d75132f4051f7f9abb65797ab9449f197acef2daa8c2ab47e70e87d81fa798c9
pdf-font-stream PDF embedded font (sfnt) at offset 0x84DA 10116 bytes