Malicious PDF — malware analysis report

Static analysis result for SHA-256 eef9e43710d5e3c1…

MALICIOUS

PDF

44.6 KB Created: 2020-10-04 07:19:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 0afda14715a7b3617abc82a8bfe31175 SHA-1: e51e815a794b7892afdb492f24de29aaccd3af8d SHA-256: eef9e43710d5e3c1a7b3838a6b2259b805d4e371853d0b35460e359dd75b8be4
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous embedded links, identified as a link farm, designed to redirect users to malicious infrastructure. One of the primary links points to 'ggtraff.ru', a known malicious redirector. The document body, though heavily obfuscated, contains a reference to the same URL, reinforcing the malicious intent. The ML classifier also strongly indicated maliciousness.

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://ggtraff.ru/strik?keyword=matriz+ortogonal+ejercicios+resueltos+pdf In PDF document text
    • https://site-1037166.mozfiles.com/files/1037166/77532986511.pdfIn PDF document text
    • https://site-1037864.mozfiles.com/files/1037864/nadin.pdfIn PDF document text
    • https://site-1037839.mozfiles.com/files/1037839/xomexipejiwefepesu.pdfIn PDF document text
    • https://site-1036659.mozfiles.com/files/1036659/17798196650.pdfIn PDF document text
    • https://site-1037180.mozfiles.com/files/1037180/kigubav.pdfIn PDF document text
    • https://site-1037142.mozfiles.com/files/1037142/20537973049.pdfIn PDF document text
    • https://site-1038597.mozfiles.com/files/1038597/22387279121.pdfIn PDF document text
    • https://site-1037237.mozfiles.com/files/1037237/volebapatela.pdfIn PDF document text
    • http://gogopo.competitorone.com/uploads/1/3/2/8/132814241/3740433.pdfIn PDF document text
    • http://files.peerteaching.co.uk/uploads/1/3/0/9/130969160/172728.pdfIn PDF document text
    • http://files.msdanahy.com/uploads/1/3/1/3/131379935/2617984.pdfIn PDF document text
    • http://kinekafu.candicelindsay.com/uploads/1/3/1/3/131398164/dujokukejomiwutu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/6550/6966/files/64688991442.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/5612/3034/files/fewewiwuvaxedujegoleri.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0480/4303/2735/files/85152686065.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/1371/3315/files/rust_base_design_2020_solo.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000061cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x61CD 5452 bytes
SHA-256: c1fcecb3c8a3de1ef54ee17a966e89faddd06eb0675a50c37515ad0a475d5ce5
font_01_sfnt_off00007486.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7486 15244 bytes
SHA-256: 9ed2a85d3e9b12e6a694f9ac9211da1cd68c4ca9d49766bbac0c4edc4d6cabd9

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