Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbe7936905b33ef7…

MALICIOUS

PDF

43.4 KB Created: 2020-10-07 04:46:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: a27e7235444f3183d4fa0ba2feab0a50 SHA-1: fa8d2646660b33e2c25146278b50255a526e0050 SHA-256: bbe7936905b33ef7d74bca03997cc165b9030f672ad0f465fa45132c63ad93d5
184 Risk Score

Malware Insights

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

The PDF file contains a significant number of embedded links, many of which point to external PDF files hosted on disposable domains. One URL, https://ggtraff.ru/strik?keyword=agradecimientos+para+tesis+a+profesores, is flagged as a malicious redirector. The ML classifier also strongly indicated maliciousness. This suggests the document is part of a link farm or SEO manipulation scheme, potentially leading to malicious content or phishing sites.

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://ggtraff.ru/strik?keyword=agradecimientos+para+tesis+a+profesores In PDF document text
    • http://files.magicandlightcollection.com/uploads/1/3/0/7/130739577/nazugosidoroxidake.pdfIn PDF document text
    • http://files.lv-connect.org/uploads/1/3/0/7/130776866/venemalojonebuwij.pdfIn PDF document text
    • http://files.hiddenfocus.com/uploads/1/3/0/9/130969704/1790764.pdfIn PDF document text
    • http://files.gladstonevolleyball.com.au/uploads/1/3/1/3/131383934/8849852.pdfIn PDF document text
    • https://site-1036869.mozfiles.com/files/1036869/ninupanotof.pdfIn PDF document text
    • https://site-1048454.mozfiles.com/files/1048454/tabuwatovedeni.pdfIn PDF document text
    • https://site-1036855.mozfiles.com/files/1036855/dezudugaximuxebadewevo.pdfIn PDF document text
    • https://site-1037077.mozfiles.com/files/1037077/90330682971.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/1/0438/3621/1357/files/10059326864.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/3039/6574/files/18_inch_laptop_dell.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0499/7909/7248/files/pojezezedoxetitisupe.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0499/8234/1280/files/nolapaxixisujalerodin.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/8472/9502/files/troy_bilt_13wv78ks011_service_manual.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/5025/5014/files/kohls_plaza_keene_nh.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_off00006010.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6010 5432 bytes
SHA-256: bd099821b49d97f3c0d5d9576ef5737246072ca946e9ca969ee2270eedd2467a
font_01_sfnt_off00007270.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7270 1800 bytes
SHA-256: a36eee06fef6ce219692c4ec918276ac99413e4fd1e3666e4031624f9289d620
font_02_sfnt_off00007afd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7AFD 10884 bytes
SHA-256: a2c5de9fb4e97f97198dfe2c8b21ff94d9aa58455aaa1811f4023e3e076f6d1b

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