Malicious PDF — malware analysis report

Static analysis result for SHA-256 62995d0f5f186a68…

MALICIOUS

PDF

51.1 KB Created: 2020-10-12 03:07:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: d6b1ba660c1c6f3aba98d4d5032ebaed SHA-1: fc40bcbab1b7b5c805c09a3ca0a528fc41977523 SHA-256: 62995d0f5f186a68e0b1aab78a2c24646980b1c5dcb9fb68315095f7b27003d7
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector infrastructure. The document body itself is heavily obfuscated but contains references to the redirector URL and other PDF links, suggesting a link farm or phishing lure. The ML classifier also strongly indicated maliciousness.

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://ttraff.link/pify?keyword=r-112sw+not+working In PDF document text
    • https://site-1043603.mozfiles.com/files/1043603/5499493094.pdfIn PDF document text
    • https://site-1036754.mozfiles.com/files/1036754/wojekapifeniwozokag.pdfIn PDF document text
    • http://files.creatingtolove.com/uploads/1/3/0/7/130775400/1840834.pdfIn PDF document text
    • http://files.roofglo.com/uploads/1/3/0/7/130776484/3009316.pdfIn PDF document text
    • http://files.davidtaylorphotographer.com/uploads/1/3/0/7/130739704/dukaxukubo.pdfIn PDF document text
    • http://juwenadi.tolistatolas.com/uploads/1/3/0/8/130814328/5513980.pdfIn PDF document text
    • http://files.airoverheadcranes.com/uploads/1/3/1/4/131406613/novitek.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/1/0482/5386/2049/files/36176247221.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/5806/8633/files/turbotax_2020_discount_code.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0486/4403/0622/files/academic_all_american.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4ef299f7-1430-4440-aff8-118a31c3670c/69807260836.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/73293ad2-8207-4d07-9a37-45a59edad80b/rudap.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_off000088af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x88AF 4992 bytes
SHA-256: b5d905abf7fe960e263e9ae2e2d0adf5c80c2afa7407040172391a9464c0aaff
font_01_sfnt_off000099de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x99DE 11228 bytes
SHA-256: 655f7e1e9ab3dae0aef60cba3e4b22c17769fd39aad3e04478c687a2fbf42969

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