Malicious PDF — malware analysis report

Static analysis result for SHA-256 f64daf131387dfa9…

MALICIOUS

PDF

39.7 KB Created: 2020-07-10 00:17:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-07
MD5: 5671f454e6dc48d15e7541a624b09ba2 SHA-1: b0d194784fe9bab0cd85bf34406380b123204c9f SHA-256: f64daf131387dfa9a55f4332cf562044649b8132453b323d6e6e949013c03fb4
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF file contains a significant number of embedded URLs, indicating a link farm designed to redirect users to potentially malicious content. One critical heuristic identified a link to known malicious redirector infrastructure. The presence of numerous PDF links suggests an attempt to manipulate search engine results or distribute malware through a large number of seemingly benign documents.

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://ttraff.com/wb?keyword=lirik%20lagu%20eddy%20kim%20the%20manual In PDF document text
    • http://files.carpetcleanergrandrapids.com/uploads/1/3/1/4/131438761/9028960.pdfIn PDF document text
    • http://files.troyelementaryspanish.com/uploads/1/3/1/6/131636930/nejovefubawevi_pewagexuvijulex.pdfIn PDF document text
    • http://files.bensawyermusic.co.uk/uploads/1/3/2/7/132740218/kelupotamevivok.pdfIn PDF document text
    • http://files.wgscontemporary.com/uploads/1/3/0/7/130739294/wifobagugeko.pdfIn PDF document text
    • http://files.mschontel.com/uploads/1/3/0/7/130738822/9169023.pdfIn PDF document text
    • http://files.capbusinessclubs.co.uk/uploads/1/3/1/4/131437210/zopenokomimu.pdfIn PDF document text
    • http://files.mikitenarch.com/uploads/1/3/1/6/131606674/3320308.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://legebepome.files.wordpress.com/2020/06/98039572228.pdfIn PDF document text
    • https://bebeleg.files.wordpress.com/2020/06/99640531573.pdfIn PDF document text
    • https://rawatufigusu.files.wordpress.com/2020/06/3725882457.pdfIn PDF document text
    • https://dijilavuxiji.files.wordpress.com/2020/06/3502846711.pdfIn PDF document text
    • https://nuzobuko.files.wordpress.com/2020/07/49353394801.pdfIn PDF document text
    • https://pegovozizow.files.wordpress.com/2020/07/46416735966.pdfIn PDF document text
    • https://wapisamuvubu.files.wordpress.com/2020/06/68019921984.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/kevaziretojigadogikoranab.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/mituvazejuremoposanizama.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/38746106010.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/fatexuxutul.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/vawis.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005417.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5417 3212 bytes
SHA-256: 6054976dde25ea3fa86a708ded747369f1817dc08708abf681153a5860f338ad
font_01_sfnt_off00005fb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5FB2 4940 bytes
SHA-256: f2aaf207b28353eca66b522919214759a3febc1e152d06208bd5a505a7555ad1
font_02_sfnt_off00007047.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7047 9764 bytes
SHA-256: 0b25549c2df867538f6ed65d4104181c5e6063829bafa1c0ed15cf8b69c880c2