Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d427aa123040604…

MALICIOUS

PDF

42.0 KB Created: 2020-10-04 09:02:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: c6bde023265ec02d05a3541a58934525 SHA-1: 3e5c5d24819598c97e69424087c132a0a712ba94 SHA-256: 2d427aa12304060432a0f005ab64025a031d0fccd5c147785945af79968a7fc2
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of embedded links, many of which point to domains associated with link farms and redirectors. The document body, though obfuscated, contains text related to an educational worksheet, suggesting a lure to disguise the malicious intent. The ML classifier strongly flagged this PDF as malicious, and the presence of links to known malicious redirectors reinforces this assessment.

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=identifying+and+correcting+sentence+fragments+worksheet In PDF document text
    • http://files.nolamix.com/uploads/1/3/1/4/131454733/ralanog.pdfIn PDF document text
    • http://files.artsideoutstudio.com/uploads/1/3/0/7/130775519/fitiv-samefadu-makivepagetubu-favedi.pdfIn PDF document text
    • http://files.kristaldawnphotography.com/uploads/1/3/0/7/130776218/nesatuzugibo.pdfIn PDF document text
    • http://lenev.shelleyheffler.com/uploads/1/3/1/4/131437425/rimefakilotoz.pdfIn PDF document text
    • http://fonobodo.aldwinlauron.com/uploads/1/3/1/0/131069910/9105984.pdfIn PDF document text
    • https://site-1037018.mozfiles.com/files/1037018/29095380230.pdfIn PDF document text
    • https://site-1040209.mozfiles.com/files/1040209/vuruwinuwonijosusuka.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://cdn.shopify.com/s/files/1/0436/5575/7977/files/22730551812.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/1227/5870/files/fusion_360_tutorial.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/8673/6286/files/bezavatel.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_off000058ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x58CA 5388 bytes
SHA-256: b18ec892961a56396b08fb83e039f2f2fd037bd68619c1b1cb756b43b62fcb33
font_01_sfnt_off00006afd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6AFD 9928 bytes
SHA-256: ea3f7a751ba0e395de6a83c453c57b7c76292ca4fef05a01575f989c1faebe5e
font_02_sfnt_off00008cec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8CEC 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71

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