Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba983b3f9eef48ee…

MALICIOUS

PDF

63.1 KB Created: 2020-10-01 02:14:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 2070ccd394194e35806f16bdb00929c6 SHA-1: aeade1b07d8c6264a202d28624068087c505aebe SHA-256: ba983b3f9eef48eec3d09e2cf99d0a2ea0ec70f9edf2b9cef66405ae2086d623
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to external PDF files hosted on various domains. One of these links, https://cctraff.ru/strik?keyword=biblia+ortodoxa+rusa+en+espa%25C3%25B1ol+pdf, is identified as a known malicious redirector. This suggests the document is part of a link farm or SEO poisoning campaign designed to drive traffic to malicious sites.

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 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.
  • 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://cctraff.ru/strik?keyword=biblia+ortodoxa+rusa+en+espa%25C3%25B1ol+pdf In PDF document text
    • http://files.kbgamesllc.com/uploads/1/3/0/9/130968915/ee3990.pdfIn PDF document text
    • http://files.dash-hounds.co.uk/uploads/1/3/0/7/130739544/9367504.pdfIn PDF document text
    • https://site-1039847.mozfiles.com/files/1039847/pofebukuwililibamiwowabo.pdfIn PDF document text
    • https://site-1039437.mozfiles.com/files/1039437/rixaxatusigujituke.pdfIn PDF document text
    • https://site-1039765.mozfiles.com/files/1039765/34877644974.pdfIn PDF document text
    • https://site-1037240.mozfiles.com/files/1037240/41526864643.pdfIn PDF document text
    • https://site-1038974.mozfiles.com/files/1038974/42890346631.pdfIn PDF document text
    • https://site-1039289.mozfiles.com/files/1039289/nofizedi.pdfIn PDF document text
    • https://site-1036719.mozfiles.com/files/1036719/naxosa.pdfIn PDF document text
    • https://site-1037005.mozfiles.com/files/1037005/lowoxovupuludusamuwiju.pdfIn PDF document text
    • https://site-1036696.mozfiles.com/files/1036696/88282862394.pdfIn PDF document text
    • https://site-1036923.mozfiles.com/files/1036923/zufunekawo.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/1/0459/6590/1991/files/base_jumping_game.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/0659/1127/files/past_simple_present_perfect_exercises_with_answers.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/9199/2480/files/pibomeropi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/7846/7222/files/61762126176.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0486/5602/3702/files/doduperovataxaxizojavo.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_off0000b4ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4AB 5504 bytes
SHA-256: 1bf5788ef1f50b9597334b0010cfe922f2a72e275c5981b9bf98c0170b60e934
font_01_sfnt_off0000c72c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC72C 11600 bytes
SHA-256: a86673faf48a44dae520399bf994106e70f06fe4b38c525d3fa07fb144c9950c

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