Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4d11d3550f113bb…

MALICIOUS

PDF

38.9 KB Created: 2020-11-02 11:05:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: f09743afdcc888a9bdce0e08280bb27a SHA-1: 4856e06fd378aacb364d82583ef2dfaaa1b7f717 SHA-256: b4d11d3550f113bbb87ccdfe15e80df0a278762517af124ccc4db476bb992581
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to a link farm designed to redirect users to malicious content. One of the primary links directs to 'ttraff.club', a known malicious redirector. The document body text, while obfuscated, contains the same keyword found in the malicious URL, suggesting a lure to trick users into clicking the links.

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.club/123?keyword=g+switch+unblocked+76 In PDF document text
    • https://cdn-cms.f-static.net/uploads/4403282/normal_5f9f60e09b5c6.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/bd5b4038-f1ac-4fee-b9aa-9e17114193b3/23158498506.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/780a6786-36db-4eae-b7cb-222f778c88cc/dazagimowinibunafu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8030c057-0a0e-41da-9336-fe7b6bad4db8/732824645.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0492/0210/2436/files/1116384059.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5c1ecad4-c231-4c25-bcd0-6e79e6d1f6fb/xabopebinaxobojazadom.pdfIn PDF document text
    • https://s3.amazonaws.com/kokesatodixon/muwusabo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0502/8311/8747/files/frequency_55_toric_xr.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/6789/9551/files/ranako.pdfIn PDF document text
    • https://s3.amazonaws.com/ropuba/30046669693.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_off000058ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x58EF 5284 bytes
SHA-256: c112fbc43c2125539abbcfcc3ddf6631fb52f0f6e0fa73551a9ac3ed7fce7fef
font_01_sfnt_off00006b05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6B05 10732 bytes
SHA-256: ed53885643718c0f3efca5d59bed69791810bca9915dc4a4ffb23f833216d926