Malicious PDF — malware analysis report

Static analysis result for SHA-256 224a28e1d6bb8681…

MALICIOUS

PDF

51.0 KB Created: 2020-09-09 05:29:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: ea74d643ab143edd82a44be455fec02d SHA-1: b757a66808e58485f4a26b1419808224885f3116 SHA-256: 224a28e1d6bb8681158ea1673066b4569c65fcf56d11ff0e16e1853d446e9d1f
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and contains links to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains URLs that appear to be part of a link farm, suggesting an attempt to manipulate search engine results or distribute malicious content. The primary IOC is the redirector URL, which is likely used to funnel victims to a malicious site.

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.ru/pify?keyword=aggiornamento+android+7.+0 In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static.usrfiles.com/ugd/db93e9_22e069f008094eb8861324e0e39296ec.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/37987b_ea878f0b20f64f4d8d2a6aa8ee54a829.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/b8c837_2f55594e5fbb4190bff4b28a406ba1ad.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/99b222_55e82313a6954ad79522c7b739aa2bfe.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/0d002d_671e90e9eb3649689a9e1b5dd6c0e684.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/3463/0554/files/basifodopebebofivar.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/9334/3912/files/benafek.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/4601/0022/files/28016445773.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/0baf77_e2974016669a4f95bfd952d9de97f060.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/739437_5c9f76e509ed45dc86e4be85851dd81c.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/30e015_fb6bdf6b4c0b4f9090fa5c8c561fa0eb.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/52b593_efe5c10f244b4f94ab69c604cd100088.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/0789d5_e664658e7b3947bda900cabcd13be7a4.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/01d500_1e703644407643659efd070814a570b9.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_off0000815b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x815B 5180 bytes
SHA-256: d8d07e74bc12c4c9d6bd8a777d6eb30623f4dae61cdbac1e33087c94774e0398
font_01_sfnt_off000092f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x92F1 17072 bytes
SHA-256: 987d6aa351af14bb80da681b2a08703ea830882c30869eaad53eee000c6ed757

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