Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2a2e1966bfd0f54…

MALICIOUS

PDF

45.9 KB Created: 2020-10-28 20:27:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 169aad18efe9b366454fc3499b3c3d70 SHA-1: 91ea9e7dfc52ab3bc4a601146fe6f6c1d9ede143 SHA-256: c2a2e1966bfd0f54b0417d0eb17b787e0d2b788c110747e876d1d09ea35e7486
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file contains numerous links designed to create a link farm, with a primary redirector pointing to malicious infrastructure. The document body, though heavily obfuscated, contains the URL that is also flagged by heuristics as a malicious redirector. The ML classifier strongly indicates maliciousness, and the overall structure suggests a phishing or scam attempt using SEO tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://gettraff.ru/pify?keyword=quest+for+milkshake+game+walkthrough In PDF document text
    • https://cdn-cms.f-static.net/uploads/4377379/normal_5f8bab168edce.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392651/normal_5f8fd618b81b4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421959/normal_5f982a94231e2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370275/normal_5f88ff6d550f9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/f0fddfb5-b7cd-45f5-929d-558fd403462d/92845699852.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0497/9795/5745/files/norse_mythology_encyclopedia.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9e1093bb-15b1-4749-a2d4-ee80a14d95ec/94471620010.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d50687b7-edf4-475d-be55-6002da67cc98/56412006267.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/72786de4-f126-423c-8c9c-f442dcd2625e/18496601166.pdfIn PDF document text
    • https://s3.amazonaws.com/susopuzupure/latekajomedawikoxonufomaz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/920d1f4e-596b-4eec-9295-0ff725234914/movata.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2620592f-e572-4f9a-98bf-67d4e1a4ea19/58164906714.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8923e7b9-8119-44e9-9f9e-2b3fd588022c/98556094370.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c86b92d2-7e74-4386-9d25-c57a1ad8599c/lojepejarutexiwobu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0480/1042/8575/files/atlas_of_medical_histology.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/54d23834-3a01-4065-810e-c338aa962ae9/gavovaxajuvokoke.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/df6d407f-7bab-4a60-930b-3a0d25b74251/36048390789.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3969b7ae-bf1e-41d0-b6b5-309b3e9b1235/tosemapuwasematiwororosun.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0500/3021/5317/files/dunipexebup.pdfIn PDF document text
    • https://s3.amazonaws.com/kofabube/nobalinim.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000677f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x677F 5176 bytes
SHA-256: 0a7a52901000d42d9e62d88f41ff5e51783509d8edead89d56f3f25ef9f94170
font_01_sfnt_off0000792b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x792B 10360 bytes
SHA-256: 27ee6bd31cffa7be34911cc2e742256ab4c7471c82e98f91b6f56645ffc28fc9
font_02_sfnt_off00009c15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9C15 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f