Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1cc15c5b54f961a…

MALICIOUS

PDF

41.8 KB Created: 2020-10-02 05:28:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: b861866d011be232c6b07bc1449c0ad0 SHA-1: 526a62144aab1e73555727d5570a02a3b45f5f66 SHA-256: f1cc15c5b54f961adceae502f1621a60faad59b631cdea662d3470c14c468571
184 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, many of which point to disposable hosting and redirect to malicious infrastructure. The document body, though heavily obfuscated, contains a URL that is also flagged as a malicious redirector. This indicates a likely attempt to direct users to malicious sites for phishing or malware delivery.

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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://cctraff.ru/strik?keyword=dungeon+siege+2+spell+guide In PDF document text
    • http://files.maxelshipping.com/uploads/1/3/2/6/132681212/dokajitobenaxiv.pdfIn PDF document text
    • http://files.healinghandsrehab.net/uploads/1/3/0/8/130814355/fisekede-bawebowedibu-tusor-gorane.pdfIn PDF document text
    • http://files.seedingreciprocity.com/uploads/1/3/1/4/131453651/gitekuwuxatimezo.pdfIn PDF document text
    • http://files.greensplendorlandscaping.com/uploads/1/3/0/7/130739362/xowib-zatanemubi-moreveko-sojuxidofe.pdfIn PDF document text
    • http://files.urbanathenscollective.org/uploads/1/3/0/7/130739239/08df2d383.pdfIn PDF document text
    • http://zodemab.christianmeditationrookies.org/uploads/1/3/1/4/131453133/19610844eb50ac.pdfIn PDF document text
    • http://jatox.whatwouldhappenif.net/uploads/1/3/2/8/132814170/d8e30b9c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/59fbfac9-6e4f-4f1a-88cf-1857311b26cf/82902844478.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/940068db-7756-44d0-bd28-07e13b98080f/82163067040.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/734856e2-ae01-4f47-851d-95bbcc55c033/77602795430.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ee6d7b5d-ee18-4613-9282-d6095c337b02/7394213684.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0485/6833/6544/files/a_more_perfect_union_activity_worksheet.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/5077/3909/files/gazevudenokajexunapu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/8512/8090/files/zukamilexusedin.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_off00005d20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5D20 4952 bytes
SHA-256: 8b845ec9eed83709ea2743a4a3f8e69a45a4ff186d446a4671e03ddd8f80c539
font_01_sfnt_off00006e1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6E1E 13976 bytes
SHA-256: 3493a636baf60d4e2e84530a997f5beee6187b4e1d83963bf19c67c4427771a4

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