Malicious PDF — malware analysis report

Static analysis result for SHA-256 1fb6dd0ec15c9c8f…

MALICIOUS

PDF

46.0 KB Created: 2020-10-30 16:55:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: d70edef6564160cd4253fbb17ac2b030 SHA-1: c6f972e7af3c592b20312f4c098b118fb95d67dd SHA-256: 1fb6dd0ec15c9c8fcd6ab4d3553b02a60b657b87b8dfcdb84621d8fd5ce436e5
124 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, with a critical heuristic firing for a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, also contains URLs that appear to be part of a link farm hosted on disposable domains. This suggests the primary purpose is to redirect users to malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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 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/123?keyword=one+shot+d%2526d+5e In PDF document text
    • https://cdn-cms.f-static.net/uploads/4367299/normal_5f8c00edd1bb3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369317/normal_5f8a6be22e4c5.pdfIn PDF document text
    • https://veborikaja.weebly.com/uploads/1/3/4/3/134317734/1923321.pdfIn PDF document text
    • https://mejefarekobuk.weebly.com/uploads/1/3/4/3/134338461/wipugikadakube-lotajobikisa-nujip.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366976/normal_5f8d58f7429a4.pdfIn PDF document text
    • https://sokuvotaboraj.weebly.com/uploads/1/3/0/7/130776263/bejogizeziputom.pdfIn PDF document text
    • https://baletepo.weebly.com/uploads/1/3/0/7/130776023/8005743.pdfIn PDF document text
    • https://birebojutadavom.weebly.com/uploads/1/3/4/3/134342015/fogogateniligaz_bixovi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365620/normal_5f86f5792f617.pdfIn PDF document text
    • https://gokajafiwewafij.weebly.com/uploads/1/3/4/3/134314986/1765515.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382784/normal_5f941a93b6f93.pdfIn PDF document text
    • https://pixabetamomu.weebly.com/uploads/1/3/1/0/131070001/satutaja.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/dazifozixawus/integrated_chinese_level_1_part_1_audio_workbook.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/efda483c-168f-4316-afe6-1c1ab3f4376f/25629295057.pdfIn PDF document text
    • https://s3.amazonaws.com/dugibabafod/tevutasurexa.pdfIn PDF document text
    • https://s3.amazonaws.com/kavitokolezub/st_benedict_prayer.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007742.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7742 4600 bytes
SHA-256: 800a6e33d45439372c41a05d2f6fead37cebc6fa05d54002b42fdf851c06e422
font_01_sfnt_off000086e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x86E3 10680 bytes
SHA-256: 5e9bfdf6be6439d24ecf6fa736b573dc17fbe98bd059bf36b5771e9fe5b06407

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