Malicious PDF — malware analysis report

Static analysis result for SHA-256 3640753a322d73f7…

MALICIOUS

PDF

33.7 KB Created: 2020-10-11 23:58:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: b124cd0b1e8c6e9d736d268f3d62874a SHA-1: 36c406e43234f6ef95f52e7786a51a40572bc188 SHA-256: 3640753a322d73f749378af5d693a244ebf26c0565684f673534bf427b1bffa6
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded links that redirect to known malicious infrastructure, specifically a URL designed to serve malicious content. The document body, though obfuscated, contains the same lure text and URLs found in the embedded links, suggesting a coordinated effort to trick the user. The ML classifier strongly indicates maliciousness, and the presence of multiple disposable domains further supports this assessment.

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://ggtraff.ru/strik?keyword=bob+dylan+all+along+the+watchtower+mp3 In PDF document text
    • https://site-1040248.mozfiles.com/files/1040248/diwukotuxilogurur.pdfIn PDF document text
    • https://site-1042432.mozfiles.com/files/1042432/27483600777.pdfIn PDF document text
    • https://site-1036799.mozfiles.com/files/1036799/jajodimut.pdfIn PDF document text
    • https://site-1037275.mozfiles.com/files/1037275/22170304587.pdfIn PDF document text
    • https://site-1040326.mozfiles.com/files/1040326/18693399257.pdfIn PDF document text
    • https://site-1037085.mozfiles.com/files/1037085/megesorupijev.pdfIn PDF document text
    • https://site-1044291.mozfiles.com/files/1044291/momopojamepagupibuposa.pdfIn PDF document text
    • https://site-1039617.mozfiles.com/files/1039617/14911931758.pdfIn PDF document text
    • http://files.alexwilsonpianist.com/uploads/1/3/1/4/131437566/1305517.pdfIn PDF document text
    • http://files.iammementors.com/uploads/1/3/1/3/131380504/4746169.pdfIn PDF document text
    • http://sekama.vividpk.com/uploads/1/3/2/3/132302780/mewixanisoxo.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/1/0499/4446/1467/files/mamma_mia_logo_transparent.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/6899/7284/files/24661909079.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0486/0238/2494/files/water_shut_off_tool_harbor_freight.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0498/9150/8382/files/betosofadijizulofuvovos.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0497/1560/9761/files/gustar_and_similar_verbs_worksheet_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_off00004521.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4521 5856 bytes
SHA-256: 8130b65e6d04ccf2ae476a05b5ea14fa1816211d13cdb8520f595e58d3870bab
font_01_sfnt_off000058fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x58FB 9692 bytes
SHA-256: 5ead1fcec6a801cb3fce7bf4d26fece8183102cb32ee1051a927b5697a4567dd

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