Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c682a23ef4d5899…

MALICIOUS

PDF

47.7 KB Created: 2020-10-08 14:34:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 442a40af3e7adb33c4f192b46f4d16e7 SHA-1: fa93e412d1db82d9b721c5ab7648b84412182c9c SHA-256: 2c682a23ef4d5899c27a6cba05b83e519f973836f2de747267b6b11a02dbabb2
184 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to known malicious redirector infrastructure or disposable hosting. The primary link identified, https://cctraff.ru/strik?keyword=ejercicios+del+alfabeto+en+ingles+pdf, is flagged as malicious. This indicates a likely attempt to lure users to malicious sites for phishing or malware delivery.

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=ejercicios+del+alfabeto+en+ingles+pdf In PDF document text
    • https://site-1037205.mozfiles.com/files/1037205/rosexixuxosudimatuban.pdfIn PDF document text
    • https://site-1037164.mozfiles.com/files/1037164/30894555194.pdfIn PDF document text
    • https://site-1038974.mozfiles.com/files/1038974/jaxedonolunewipiv.pdfIn PDF document text
    • https://site-1039517.mozfiles.com/files/1039517/4325073580.pdfIn PDF document text
    • https://site-1036911.mozfiles.com/files/1036911/vasewite.pdfIn PDF document text
    • http://nipezi.fbc-kva.org/uploads/1/3/0/7/130775934/tejigejafijedawobom.pdfIn PDF document text
    • http://files.secondfamilyenglish.com/uploads/1/3/1/4/131438228/kejoxekenarub.pdfIn PDF document text
    • http://files.suburbanmaven.com/uploads/1/3/0/7/130738548/110998.pdfIn PDF document text
    • http://donagezix.heatherleeanndesigns.com/uploads/1/3/2/6/132680874/c1f185f249e28a.pdfIn PDF document text
    • http://gisuza.portofpaws.com/uploads/1/3/2/6/132681237/bivaw-wodidosedukegez-zalaju.pdfIn PDF document text
    • http://files.mackenziefreed.com/uploads/1/3/2/7/132712040/1139834.pdfIn PDF document text
    • http://puguwo.darcyclarke.us/uploads/1/3/2/6/132696056/gofidu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://cdn.shopify.com/s/files/1/0431/4886/9786/files/susubojalaxilepegup.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005ab0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5AB0 5284 bytes
SHA-256: f9be71ff3f0aad066ec5a8b1a974f25676a696333fed7cb68b2d1574db493d7b
font_01_sfnt_off00006ca9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6CA9 3940 bytes
SHA-256: e88311ea2d2e68ee10f90806ba21c029d275378842919fbff6bb51cd3c355886
font_02_sfnt_off00007b5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7B5B 11824 bytes
SHA-256: fa37bac96cf9e3b5c07366d070bb579bcc4fb592db6573e9626aeed31eab0e2c
font_03_sfnt_off0000a154.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA154 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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