Malicious PDF — malware analysis report

Static analysis result for SHA-256 5616c83c2cabdb95…

MALICIOUS

PDF

42.7 KB Created: 2020-10-06 12:27:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 3552a7352c0f511ba5d4aa5e5b18dc7e SHA-1: f06554f4915d6583bcbcf57aeb58efad77fab598 SHA-256: 5616c83c2cabdb95a759aac914e578e90afa3ff7f17cca920f4e92d997ed58d2
124 Risk Score

Malware Insights

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

This PDF document contains numerous embedded links, including one pointing to known malicious redirector infrastructure at `https://cctraff.ru/strik?keyword=boy+scout+handbook+13th+edition+pdf+download`. The document body also contains obfuscated text and references to the 'boy scout handbook' to lure users into clicking these links. The ML classifier strongly indicated maliciousness, and the presence of multiple disposable domain links further supports a malicious intent, likely to redirect users to a phishing or malware download site.

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://cctraff.ru/strik?keyword=boy+scout+handbook+13th+edition+pdf+download In PDF document text
    • https://site-1037121.mozfiles.com/files/1037121/romadixudurip.pdfIn PDF document text
    • https://site-1043843.mozfiles.com/files/1043843/60049147195.pdfIn PDF document text
    • https://site-1041583.mozfiles.com/files/1041583/gilofefirafodu.pdfIn PDF document text
    • https://site-1039959.mozfiles.com/files/1039959/36037478612.pdfIn PDF document text
    • https://site-1040617.mozfiles.com/files/1040617/kidosoroz.pdfIn PDF document text
    • https://site-1037907.mozfiles.com/files/1037907/wutoxuvomaxetewupami.pdfIn PDF document text
    • https://site-1038586.mozfiles.com/files/1038586/giwek.pdfIn PDF document text
    • https://site-1039749.mozfiles.com/files/1039749/rupejexip.pdfIn PDF document text
    • https://site-1036814.mozfiles.com/files/1036814/20250090678.pdfIn PDF document text
    • http://veruxe.harveyrpeck.net/uploads/1/3/2/6/132680977/liniledimepaka_bapizeloge_gobitomipimov.pdfIn PDF document text
    • http://tunulil.kvegasnuts.com/uploads/1/3/0/8/130814297/lepilumotari.pdfIn PDF document text
    • https://site-1048482.mozfiles.com/files/1048482/zadolakax.pdfIn PDF document text
    • https://site-1036997.mozfiles.com/files/1036997/wojuxuvomazozarotolonox.pdfIn PDF document text
    • https://site-1039494.mozfiles.com/files/1039494/38633155736.pdfIn PDF document text
    • https://site-1048208.mozfiles.com/files/1048208/nubaruvolufezexawusoxinaw.pdfIn PDF document text
    • https://site-1036884.mozfiles.com/files/1036884/22166792765.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000672f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x672F 5812 bytes
SHA-256: 923a98f71569c1f8d94d41d4d31eef84b59b45257d3bb1c52ad44804bb132591
font_01_sfnt_off00007b1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7B1D 10164 bytes
SHA-256: 7e7694b176c6c3ff694fa6648124eb6ce351f1371d8c17690a158521b682858c

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