Malicious PDF — malware analysis report

Static analysis result for SHA-256 0bf4392921598775…

MALICIOUS

PDF

42.6 KB Created: 2020-10-06 22:10:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 41a87a029f1cb151d9bcc1ef7fc5e2a1 SHA-1: f8e26d2014edd77896526b3e0fffe94c75361323 SHA-256: 0bf4392921598775993edb8f78e7999c0990808be98134d236d6a7ab9ef716cc
184 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to external PDFs hosted on various domains. One of these links, https://cctraff.ru/strik?keyword=stihl+fs+55+parts+breakdown, is identified as a known malicious redirector. The document's structure and content suggest it is designed to lure users into clicking these links, potentially leading to further malicious activity.

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://cctraff.ru/strik?keyword=stihl+fs+55+parts+breakdown In PDF document text
    • http://files.bethbooram.org/uploads/1/3/1/4/131437493/4358940.pdfIn PDF document text
    • http://files.pariswritersretreat.com/uploads/1/3/1/8/131872198/pefusaso-tivojen-setarumuj.pdfIn PDF document text
    • http://files.techsolcongrp.com/uploads/1/3/2/8/132814136/d34297.pdfIn PDF document text
    • https://site-1037145.mozfiles.com/files/1037145/texanozevulilurati.pdfIn PDF document text
    • https://site-1039198.mozfiles.com/files/1039198/worivorakepabajib.pdfIn PDF document text
    • https://site-1037860.mozfiles.com/files/1037860/bugoxumu.pdfIn PDF document text
    • https://site-1036861.mozfiles.com/files/1036861/guxubinelujelusenazonojar.pdfIn PDF document text
    • https://site-1039515.mozfiles.com/files/1039515/46565817268.pdfIn PDF document text
    • http://zafuk.suppesehconsulting.com/uploads/1/3/0/8/130813528/zagoxaseropux_xipolixudadi_gebosuz.pdfIn PDF document text
    • http://files.adelaideswordacademy.com/uploads/1/3/1/3/131381112/1468809.pdfIn PDF document text
    • http://files.fhbcofhartsville.org/uploads/1/3/0/9/130969507/tovapafi.pdfIn PDF document text
    • http://files.maronrodmd.com/uploads/1/3/1/3/131398182/bamafemefojun-pemosobuxobi-fejow-mugurobu.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/1/0431/5650/4744/files/26620610193.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/3584/3994/files/23560438746.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/3266/9081/files/giants_found_in_clearwater_minnesota.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0462/7732/9056/files/kitchen_utensils_small_equipment_identification_answers.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_off00006643.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6643 5652 bytes
SHA-256: d3e0ed687b6afd2c7e9ae2031253ad011dc0979462bb02ab7a8cbb7dee8ba765
font_01_sfnt_off00007987.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7987 10492 bytes
SHA-256: 89e5e4bbd1cd40c10dbdbe7b79faf4fbf037276f4bd40b2fcfee35738133688c

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