Malicious PDF — malware analysis report

Static analysis result for SHA-256 4025c7ae6ca4cf6f…

MALICIOUS

PDF

34.4 KB Created: 2020-10-12 08:36:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: ad6c952da4a68adeeeb36f49c92bbc1f SHA-1: 6c6d11c469789c042b77ed6a427e87423328a335 SHA-256: 4025c7ae6ca4cf6ffadaef9c5b47ad94ed100639fd83fb19c464091c9f102dac
184 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to disposable hosting and redirecting to malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though partially corrupted, contains text related to a free business textbook download, which serves as a lure. The ML classifier strongly flagged this PDF as malicious, suggesting it's part of a link farm designed to distribute malware or lead to phishing sites.

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://ggtraff.ru/strik?keyword=understanding+business+12th+edition+pdf+free+download In PDF document text
    • http://files.taylorsvillefirstbaptist.com/uploads/1/3/2/3/132303282/fesozizefo.pdfIn PDF document text
    • http://xawumo.elizabethcyr.com/uploads/1/3/1/4/131453872/nogasasesesan-wezavukesipa.pdfIn PDF document text
    • http://files.ledgestonecondominium.com/uploads/1/3/0/8/130813764/kurabowirepofif.pdfIn PDF document text
    • http://wamowop.centraloregonmastersingers.org/uploads/1/3/1/8/131872096/8260006.pdfIn PDF document text
    • http://sifufepof.mahakaitreasures.com/uploads/1/3/1/3/131381241/vakozekurame_mukale_kafam_libuwasi.pdfIn PDF document text
    • http://files.onedollarapologist.net/uploads/1/3/2/6/132681946/jenavogabugenetir.pdfIn PDF document text
    • http://kanun.borkadancer.com/uploads/1/3/0/9/130969461/72d07.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/1/0430/3260/8921/files/31876360398.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/4971/2806/files/iship_track_it_track_packages.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/6163/5991/files/44231228483.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/4430/1721/files/house_built_on_sand_song.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f30277bd-23ad-464d-9c45-78077e43e7ac/76098096042.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2da8c58b-88a6-40b4-b360-86020e1b5740/81498761950.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/438efa77-b4ee-4e2e-8395-a691f0f15e77/97488534218.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_off00004792.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4792 5708 bytes
SHA-256: 5135260f98654b17b6c761171767cc1fec4c47e7691adf4b2edcb1d1a09c2752
font_01_sfnt_off00005b0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5B0D 9776 bytes
SHA-256: 9e25e64769084cd5b921d6e07dd73d7caf402054c52cfc52e5be1f6e15c82ae9

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