Malicious PDF — malware analysis report

Static analysis result for SHA-256 0761baae91c64cea…

MALICIOUS

PDF

55.0 KB Created: 2020-07-13 08:27:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 123f6bc1d49e212676a08ef35adc5856 SHA-1: 1487f65b980c44216cd95c8d4768493e0dde4850 SHA-256: 0761baae91c64cea2d3de363a7906af36c8580a240ce4b73d98a255f30e937ab
154 Risk Score

Malware Insights

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

The PDF was flagged as malicious due to a high number of embedded links, with one specifically identified as a malicious redirector. The document body is heavily obfuscated, but the presence of numerous external links, including those pointing to WordPress PDF files, suggests a link farm or phishing attempt. The ML classifier strongly supports the malicious verdict.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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 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.
  • 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://ttraff.com/pify?keyword=t%25E1%25BA%25A3i+b%25C3%25A0i+h%25C3%25A1t+b%25E1%25BA%25A1n+%25C6%25A1i+h%25E1%25BA%25BFt+gi%25E1%25BB%259D+r%25E1%25BB%2593i
    • http://files.studioappalachia.com/uploads/1/3/2/6/132681823/mofikow.pdf
    • http://files.mectacprinstructor.com/uploads/1/3/1/4/131437740/2f469132278.pdf
    • http://files.nicoleedwardslimited.com/uploads/1/3/1/4/131437161/pebutubukor_makapaw_tumavuzopu.pdf
    • http://files.lookingbacklineage.com/uploads/1/3/1/4/131453401/2d2aa.pdf
    • http://files.besttoysbyage.com/uploads/1/3/2/6/132681596/314f5f.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://dopaniteje.files.wordpress.com/2020/07/31732708743.pdf
    • https://gugofesid.files.wordpress.com/2020/07/23933711776.pdf
    • https://ziwoxupo.files.wordpress.com/2020/07/wipebefirajekene.pdf
    • https://wokediwiwoj.files.wordpress.com/2020/06/xorulusanajofiromuvarotav.pdf
    • https://dukugakux.files.wordpress.com/2020/07/wepoxesakemusosol.pdf
    • https://legebepome.files.wordpress.com/2020/07/50677378626.pdf
    • https://wurataz.files.wordpress.com/2020/06/nodefebibu.pdf
    • https://sezuwom.files.wordpress.com/2020/07/penevuseketelumi.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/zokiwu.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/zevimija.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/widizosatadusuzovasovodas.pdf
    • https://cdn.shopify.com/s/files/1/0430/2834/9079/files/26140427531.pdf
    • https://cdn.shopify.com/s/files/1/0431/6630/2376/files/11811564499.pdf
    • https://cdn.shopify.com/s/files/1/0428/4776/4636/files/tabawufoxek.pdf
    • https://cdn.shopify.com/s/files/1/0433/2742/2632/files/59014423876.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/85583151980.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/99839510681.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006728.bin
d4e5827cf49571caab480af60145821b46a2fbe290b93d2922bc2ec98553d0f0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6728 5768 bytes
font_01_sfnt_off00007874.bin
de0c71d082ab29c4ca8a63c54941a8b64868ac4cdf3365011bc6e6c674972eb5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7874 4032 bytes
font_02_sfnt_off000086cf.bin
ddd2723def919918174a4a3c791f3db141d349c8d3c848417e35ad53eff89487		 pdf-font-stream PDF embedded font (sfnt) at offset 0x86CF 21400 bytes
font_03_sfnt_off0000b69b.bin
e9fe716c2abc985b12a899a49d5539e4e8be1b56d50c083b30290d85a2a7c848		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB69B 16092 bytes

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