Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf9f452e1e51ec11…

MALICIOUS

PDF

43.5 KB Created: 2020-10-01 16:46:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 45fca2cb46986be5ba51891148e7b024 SHA-1: 584b2b832849f137663921d60817c9dbc7665b2d SHA-256: bf9f452e1e51ec118390b0c8956292e3c065382c8aee45e125afefe8b7a2fa0a
184 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links pointing to various PDF documents hosted on disposable domains. One of the embedded URLs, https://gettraff.ru/strik?keyword=amendment+of+indian+constitution+pdf+in+hindi, is flagged as a known malicious redirector. The document's structure and link farm behavior suggest it is used for SEO manipulation or to distribute further malicious content, potentially leading to malware downloads or phishing attempts.

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=amendment+of+indian+constitution+pdf+in+hindi In PDF document text
    • https://site-1037282.mozfiles.com/files/1037282/73560858507.pdfIn PDF document text
    • https://site-1039175.mozfiles.com/files/1039175/jekojof.pdfIn PDF document text
    • https://site-1036748.mozfiles.com/files/1036748/fibazisitovazulopedigu.pdfIn PDF document text
    • http://files.9thwave.net/uploads/1/3/0/9/130969573/pomotojit_lodililenagov_gepaporexag.pdfIn PDF document text
    • http://files.exquisiteair-water.com/uploads/1/3/1/3/131383719/mapotafebares_badutumirogo_vozedezoxe.pdfIn PDF document text
    • http://velasi.kenpovideo.com/uploads/1/3/0/7/130740596/fifuvegow_juroxowoli_wazitujofuvabo_rivamejepipazi.pdfIn PDF document text
    • http://xumos.medicalmercycanada.org/uploads/1/3/0/9/130969021/5339759.pdfIn PDF document text
    • http://baduxemod.southbayreikiandwellness.com/uploads/1/3/1/1/131164239/pirilijutu_rezos_nijifebebad.pdfIn PDF document text
    • https://site-1037175.mozfiles.com/files/1037175/28348539395.pdfIn PDF document text
    • https://site-1037241.mozfiles.com/files/1037241/gupajase.pdfIn PDF document text
    • https://site-1038372.mozfiles.com/files/1038372/rokesirezu.pdfIn PDF document text
    • https://site-1039922.mozfiles.com/files/1039922/8826796241.pdfIn PDF document text
    • https://site-1038343.mozfiles.com/files/1038343/53018055282.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off00006c5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6C5C 5256 bytes
SHA-256: 9b6e45ccf1c76a25c05574a9f737f0fd65a70d51ad3ed06bbafdac28a0c4b64a
font_01_sfnt_off00007e20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7E20 10192 bytes
SHA-256: e131e7efdfd6640a5b6685a0791cfe103bfe1f4261b29ab0f5dbf6fcac7a6935

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