Malicious PDF — malware analysis report

Static analysis result for SHA-256 8eb908298283e217…

MALICIOUS

PDF

50.2 KB Created: 2020-10-02 21:24:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: c1a6dc328e86d223bab745395e3eda4e SHA-1: 565f39611ad674ca9376d1e7fd539fa545e73420 SHA-256: 8eb908298283e217f20bdd4b115843b1a81f10c82707b5010c4be8162c3df993
124 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with a critical heuristic firing for a link to a known malicious redirector. The document body, though heavily obfuscated, contains references to these URLs and appears to be a lure for 'ejercicios de metrica resueltos pdf'. The ML classifier also strongly indicated maliciousness. The primary attack pattern involves luring the user to click on these links, which likely leads to a phishing page or malware download.

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=ejercicios+de+metrica+resueltos+pdf In PDF document text
    • https://site-1037230.mozfiles.com/files/1037230/17475638639.pdfIn PDF document text
    • https://site-1037207.mozfiles.com/files/1037207/58645563670.pdfIn PDF document text
    • https://site-1037010.mozfiles.com/files/1037010/dogikaribolakemuzex.pdfIn PDF document text
    • http://bimotu.bluehawkrecords.com/uploads/1/3/2/6/132680903/desikibojam_vomoluxuxire_vapenujune.pdfIn PDF document text
    • http://files.newwavegymnastics.com/uploads/1/3/1/6/131636712/9667781.pdfIn PDF document text
    • http://lokerig.melepana.com/uploads/1/3/1/8/131871674/xabobatugo.pdfIn PDF document text
    • http://files.laurabreaux.com/uploads/1/3/2/7/132740351/babeberasex.pdfIn PDF document text
    • http://files.twochicksandarod.com/uploads/1/3/0/7/130776043/mojominatonesu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/42cc5544-691e-42f6-b29d-9faeeb8cdba7/mipopew.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/67b7b5fa-09bd-4eb8-9715-4e9e59227769/nupipilazukuguzibuxebi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7d4f9148-759d-4c00-ac2f-289f05b51ece/64958912573.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/420f8d50-4b85-4447-baba-38b25184561b/70664211418.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/53935474-6d6f-4f6b-b033-2832140a1943/74080790735.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_off0000739f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x739F 5336 bytes
SHA-256: 537052ee041b9c58f390eaa932f1f339f63aadab1fd8ab74883e047e195f6364
font_01_sfnt_off000085b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x85B3 17828 bytes
SHA-256: a0db7c6c521c2ccaeb4aa5bc553775501c41b78d5c3535b1812d2460370e1885

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