Malicious PDF — malware analysis report

Static analysis result for SHA-256 45dacfd4b4ff98fe…

MALICIOUS

PDF

40.4 KB Created: 2020-10-12 07:04:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 9e74fd11798e4dc046cffb486933ed1a SHA-1: dc5cd85fe029670a375a6decd736b90a2aa38484 SHA-256: 45dacfd4b4ff98fe13a2614a1d0cfc21bbe84ba59e81a1a2e40189ea2c44dc8d
124 Risk Score

Malware Insights

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

The PDF document contains embedded links that lead to a known malicious redirector, disguised as a download for a popular movie. The ML classifier strongly indicated maliciousness, and the document structure suggests it's part of a link farm designed to distribute malware. No scripts were extracted, but the presence of malicious links is the primary indicator of compromise.

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=descargar+rapido+y+furioso+7 In PDF document text
    • https://site-1036665.mozfiles.com/files/1036665/vewifuxojara.pdfIn PDF document text
    • https://site-1038421.mozfiles.com/files/1038421/lutebura.pdfIn PDF document text
    • https://site-1038608.mozfiles.com/files/1038608/witixazukidixo.pdfIn PDF document text
    • https://site-1041183.mozfiles.com/files/1041183/26870207738.pdfIn PDF document text
    • https://site-1039476.mozfiles.com/files/1039476/fasazidid.pdfIn PDF document text
    • https://site-1043793.mozfiles.com/files/1043793/86041255058.pdfIn PDF document text
    • https://site-1036839.mozfiles.com/files/1036839/63303669356.pdfIn PDF document text
    • https://site-1036640.mozfiles.com/files/1036640/79808368748.pdfIn PDF document text
    • http://files.batcavephotography.com/uploads/1/3/1/0/131069992/kititefiki-faxadefikaj-xetigojo.pdfIn PDF document text
    • http://masuru.gruupmeet.com/uploads/1/3/2/6/132681231/ece251ef.pdfIn PDF document text
    • http://files.tomashstrnad.com/uploads/1/3/1/1/131163494/6038522.pdfIn PDF document text
    • http://kidowisu.alabamacivicchorale.com/uploads/1/3/1/4/131454237/nipepijolubiwilofon.pdfIn PDF document text
    • http://files.virginiacitytreasureisland.com/uploads/1/3/0/7/130740625/kiliberulonurifati.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/7885cbce-cab1-4c73-948a-a9dedf1e2e6e/16423868264.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3f9db5ce-9329-439b-be1c-9337653cb3bd/37029554628.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bad4578a-989b-412e-bd05-2a2a06608153/70458800324.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9350a0ae-a150-464a-9844-b09d211ad45f/92573882744.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/db7cb596-82d2-4a2c-b5e1-547e77cfdeb3/94130122002.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_off00005b09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5B09 5472 bytes
SHA-256: 5f4237307d7064efc1f56d4afcca62496a49c32bbe0ace1ee555d41cb1683c59
font_01_sfnt_off00006dc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6DC4 11656 bytes
SHA-256: e7ed2fcbabad31ac5107da6b026a16831646ef5b571579c17656e1d859a2080b

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