Malicious PDF — malware analysis report

Static analysis result for SHA-256 083561cd3d64c876…

MALICIOUS

PDF

59.5 KB Created: 2020-10-07 08:17:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 66a6729a2f5eca52464d9685ca01c352 SHA-1: d192c80128d976499dffc3e184487dabaa3cf339 SHA-256: 083561cd3d64c87628f2af37372a5fc7bc1d57fbaa0c65fe05ad2493f212553d
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains a link to a known malicious redirector, which is designed to lead users to potentially harmful websites. The document also functions as a link farm, hosting numerous other PDF files on disposable domains, suggesting a coordinated effort for SEO manipulation or malware distribution. The presence of a callback lure further indicates a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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/pify?keyword=determine+the+ending+balance+of+each+of+the+following+t-accounts.+chegg In PDF document text
    • https://site-1038387.mozfiles.com/files/1038387/6215236300.pdfIn PDF document text
    • https://site-1037094.mozfiles.com/files/1037094/77614121234.pdfIn PDF document text
    • https://site-1036977.mozfiles.com/files/1036977/26245186668.pdfIn PDF document text
    • https://site-1037132.mozfiles.com/files/1037132/papulurudoleza.pdfIn PDF document text
    • https://site-1037142.mozfiles.com/files/1037142/vugupiw.pdfIn PDF document text
    • https://site-1043582.mozfiles.com/files/1043582/81308790672.pdfIn PDF document text
    • http://lilirapuv.thestanfields.org/uploads/1/3/1/4/131483112/zajarobex_dewonurofover_tijukujug_levajesoliwuf.pdfIn PDF document text
    • http://files.gabriellaquiroz.com/uploads/1/3/2/6/132682051/499bb465cb7026.pdfIn PDF document text
    • http://files.theculinaryedgetv.com/uploads/1/3/2/3/132303170/babefefadixubeg.pdfIn PDF document text
    • http://files.missmissionminded.com/uploads/1/3/1/4/131438018/40c27a8381.pdfIn PDF document text
    • http://files.whatcomexcavator.org/uploads/1/3/2/6/132682048/mololetarom-sijexazofig-fazuvapumi-gikerototuduwi.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/1/0481/3996/0487/files/dutusunurosufitodel.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/8497/2183/files/56210376665.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000091b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x91B4 5732 bytes
SHA-256: 2cf409de5cef0c574b54c5116b061a366bada0d73fe5f090cf4a066c70844b52
font_01_sfnt_off0000a524.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA524 10340 bytes
SHA-256: 2495d5b36ad079ba41c606839c06366e6f11c35e9e988c3d8f94c3825b9bf0fb
font_02_sfnt_off0000c8a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8A6 16084 bytes
SHA-256: 62a91fb32920f6e8cc04f0b1e834142448e73e4a31e16512d2a7fd751ba0d286

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