Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d90b672a0d3f33b…

MALICIOUS

PDF

38.1 KB Created: 2020-09-06 04:54:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: a1c0f4f09fa24d43eb7425aa0cb14cc2 SHA-1: 3888d3ea7d107dc448fc9f011361e953c5e41fc3 SHA-256: 4d90b672a0d3f33ba5350dd0382f8dfafda2cbc7930f125b48101cdf8135f265
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.link/wix?keyword=calendula+propiedades+pdf'. Additionally, it exhibits characteristics of a PDF link farm, with numerous external PDF links, including one to 'https://cdn.shopify.com/s/files/1/0433/0058/5636/files/kitapezapofamedokozato.pdf'. The ML classifier also strongly flagged this PDF as malicious. These indicators suggest the primary purpose is to lure users to malicious infrastructure.

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 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.link/wix?keyword=calendula+propiedades+pdf In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0058/5636/files/kitapezapofamedokozato.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/0870/5187/files/mitonukunokobodusol.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/6370/4729/files/30837076874.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/6016/5797/files/nomutexitomipogevuxe.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9665/4499/files/febuj.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/5564/3813/files/36459770627.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/accd1f_1be0cb3c91e64eac8cdc4a4243909f58.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/911c12_7ac412f908df4cd28b5aaedf8c931d71.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/10e3af_6580029bf6764f0a8314b3853cf0e82a.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/79e0dc_f97832a0ffb540449c45241de5eab813.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/afbef4_8cf0b5e9ddd2413280c997f5bbdace99.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/7192/2591/files/bokaseziwovi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/8122/7672/files/97553590038.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_off00005af0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5AF0 4940 bytes
SHA-256: e00f78a37dd754ed10dbd572f71fc560e29119db6e49def8d81c7e72dbbe2400
font_01_sfnt_off00006bc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6BC4 9476 bytes
SHA-256: 9812a34ab800a264045c32601fab4928a5ecb2dab33154cae3bd1a438e2b0516

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