Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d7bc5aa190e3978…

MALICIOUS

PDF

31.8 KB Created: 2020-10-04 20:56:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: e955a96f3dde4ff495a5a228e03b7026 SHA-1: bdd7f9cc8feffa093789f2402ab277d1d3a2d8fc SHA-256: 2d7bc5aa190e3978cfdde039263171bd75e8aad9efc6af8e7b5e2f3f2a7e39ca
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by an ML classifier and contains numerous embedded links. One of these links, https://gettraff.ru/strik?keyword=sloan+flush+valve+parts+pdf, points to known malicious redirector infrastructure. The document appears to be part of a link farm, likely intended for SEO manipulation or to distribute further malicious content.

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://gettraff.ru/strik?keyword=sloan+flush+valve+parts+pdf In PDF document text
    • https://site-1039315.mozfiles.com/files/1039315/64640356269.pdfIn PDF document text
    • https://site-1036744.mozfiles.com/files/1036744/86339654762.pdfIn PDF document text
    • http://zalasotob.phimudelta.org/uploads/1/3/0/8/130874067/5742931.pdfIn PDF document text
    • http://files.letsenditcnmi.com/uploads/1/3/2/8/132815003/lizatuboguzil-sakipu.pdfIn PDF document text
    • http://files.balletclassique.net/uploads/1/3/1/6/131607600/68228aa45095.pdfIn PDF document text
    • http://nuxudeboz.fortbrookgames.com/uploads/1/3/1/0/131071252/21f14131d6c70be.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/5d9196fc-1153-471f-b8aa-d1cdadfd3291/zateropokefavukebokene.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9c94e944-e76e-4bcf-93de-a48ec38e9dc4/dorerukisikizemudaduk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dbfb557e-ac61-4365-a7f3-0fc6a2a4432b/kadawavaxes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cfc62c61-7f49-4eb7-8724-d401c23a3e19/nizaweweduropige.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0488/2065/0149/files/71619081973.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/6211/7031/files/10862043856.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/1681/3735/files/rupewiki.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/3524/7271/files/creflo_dollar_books.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_off0000425c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x425C 5292 bytes
SHA-256: fca7043464917f6f85a01ff47b0284111f01d276c5ba2012391b44b94b783dc9
font_01_sfnt_off0000545e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x545E 8852 bytes
SHA-256: a088362c0d82fb3a0a5fad9a1edfc5df62bcc8579237b621310ff86b7706e1dc

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