Malicious PDF — malware analysis report

Static analysis result for SHA-256 b656ac061497e045…

MALICIOUS

PDF

68.7 KB Created: 2020-11-03 08:05:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 401c80a2cda39e591173943a98c5fe28 SHA-1: 79a82649b8cfde4d871feb6ef1e56b6b57c40cbb SHA-256: b656ac061497e045074449f5af608139fb4fa7fa7f9783e56b7503105558179a
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains a large number of links to external PDFs hosted on various disposable domains, indicating it functions as a link farm. One of the initial links points to known malicious redirector infrastructure, suggesting a potential for further malicious activity or SEO manipulation. No scripts were extracted, and the document body was heavily obfuscated and truncated, limiting further analysis of its specific intent beyond link distribution.

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/aws?keyword=go+math+grade+4+chapter+4+test In PDF document text
    • https://vefozifus.weebly.com/uploads/1/3/4/3/134382693/35c87.pdfIn PDF document text
    • https://vuzevarezevarot.weebly.com/uploads/1/3/0/7/130740461/kisesajotikevezi.pdfIn PDF document text
    • https://paleforekirito.weebly.com/uploads/1/3/4/5/134579508/ddf72ff2.pdfIn PDF document text
    • https://neburaguvud.weebly.com/uploads/1/3/4/4/134477844/4301079.pdfIn PDF document text
    • https://wanezevidika.weebly.com/uploads/1/3/4/5/134588498/lilejul.pdfIn PDF document text
    • https://dajexave.weebly.com/uploads/1/3/4/3/134352807/5214192.pdfIn PDF document text
    • https://gunewobeje.weebly.com/uploads/1/3/4/1/134109175/dugox-govubenojud-togumesibolog.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388060/normal_5f97978d5f1dd.pdfIn PDF document text
    • https://xofeboje.weebly.com/uploads/1/3/4/5/134584890/3368838.pdfIn PDF document text
    • https://bajusumuke.weebly.com/uploads/1/3/2/7/132741128/sigun-misul-degadolisuvevo-jelofaxitalafon.pdfIn PDF document text
    • https://gasuzenop.weebly.com/uploads/1/3/4/2/134266144/jopuzi.pdfIn PDF document text
    • https://xulalotuk.weebly.com/uploads/1/3/4/5/134593582/lagemosizaguk-kowalefumabe-samozexepaz.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/1/0486/8256/5782/files/guserire.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4297b18b-dc02-4e57-b9be-f75f9660a796/kokinemi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/64e12d88-da3c-4b2a-b60c-e752e61fc05a/68178037878.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000a54f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA54F 6504 bytes
SHA-256: 13cfdcd846f40b0ab8160602337cd8e39726359d1476d12f5a7aedc0664482fb
font_01_sfnt_off0000b589.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB589 5576 bytes
SHA-256: 5d0cfc89a49e6ade1b5892551d01cb56e7b5e22f445137cb17a6fadc097f713e
font_02_sfnt_off0000c859.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC859 11860 bytes
SHA-256: ecb5a2a6044c7d86946c6a66fc6982ea8a6055874c3e0f63296df7245f04d23a
font_03_sfnt_off0000f03b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF03B 16064 bytes
SHA-256: 352405b3e263a2154bdaeeb3ba3a2a46c37317fe5ae82628645d5b5915a0c68d