Malicious PDF — malware analysis report

Static analysis result for SHA-256 7447ca4d79ae0d0b…

MALICIOUS

PDF

80.9 KB Created: 2020-11-09 17:15:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: d138d5b56ed8f4ae766bf09dd27e6cd1 SHA-1: f9c5758fe9d3948f8d606183c4046a25082ef9e1 SHA-256: 7447ca4d79ae0d0bbd9ad6de8af1e800bfd9030413d7e466b96632c90b369031
304 Risk Score

Malware Insights

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

This PDF document contains numerous links to external resources, many hosted on disposable domains, indicating a link farm designed to distribute malicious content. The presence of a link to a known malicious redirector and a Facebook brand impersonation lure strongly suggests a credential phishing or malware distribution campaign. The document's structure and embedded links are consistent with techniques used to bypass gateway security and deliver secondary payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 8

  • 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.
  • Brand-impersonation credential phishing lure critical SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: action link to abused redirector https://rofexigu.weebly.com/uploads/1/3/0/7/130738805/6a634e617.pdf.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://traffking.ru/123?keyword=loppet+2020+results In PDF document text
    • https://rofexigu.weebly.com/uploads/1/3/0/7/130738805/6a634e617.pdfIn PDF document text
    • https://nelemiken.weebly.com/uploads/1/3/4/7/134704654/duxalaxulobu.pdfIn PDF document text
    • https://dubuzosokiboxof.weebly.com/uploads/1/3/1/1/131163723/646c3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368227/normal_5f882d94bab8a.pdfIn PDF document text
    • https://sugosagugijew.weebly.com/uploads/1/3/4/5/134584769/xijevajajetawoj-tinekuxux-bikoniko.pdfIn PDF document text
    • https://wodedofa.weebly.com/uploads/1/3/4/3/134320626/964550.pdfIn PDF document text
    • https://xubafema.weebly.com/uploads/1/3/4/4/134447535/7304676.pdfIn PDF document text
    • https://ligotilup.weebly.com/uploads/1/3/4/3/134313371/8da2a6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389599/normal_5f9dfaebd407e.pdfIn PDF document text
    • https://misutinulil.weebly.com/uploads/1/3/1/4/131407711/4639d47.pdfIn PDF document text
    • https://kijatuvoriwoze.weebly.com/uploads/1/3/4/3/134352029/4717149.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392664/normal_5f9a309b5afe0.pdfIn PDF document text
    • https://julapaxukej.weebly.com/uploads/1/3/4/4/134492969/dokafirepizenab-pudobaganile-gotafafo.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f349.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF349 2880 bytes
SHA-256: aff11289bf87f92bc53c0e2abc335208e29b6db8a954e82fd0a5595ffa95d344
font_01_sfnt_off0000fd87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD87 4820 bytes
SHA-256: 80c69a6f7c54d300b342204dcc7944c832b5c499380410e1b1a61582abf58731
font_02_sfnt_off00010e02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E02 11908 bytes
SHA-256: 98628c11ae54e7fa91f441f86083e70963e46bda93ab5ced638a1617f6be5c1c