Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4d5e61de4ea6ccf…

MALICIOUS

PDF

40.8 KB Created: 2020-08-23 04:09:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 1d8abb86575f49f41bab6e36adc92cab SHA-1: 2a72d9468f7998e6aa13c697c909c0c52fc2115a SHA-256: f4d5e61de4ea6ccfa0abe8049afd64d664335cd672e18726b767b771894d9451
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to a known malicious redirector. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' and 'PDF_SEO_LINK_FARM' indicate that the primary purpose of this document is to direct users to malicious infrastructure. The ML classifier also strongly supports a malicious verdict.

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=antenna+and+wave+propagation+pdf+by+bakshi In PDF document text
    • http://biramoguv.inspiredwellbeing.com.au/uploads/1/3/2/8/132815176/ce0479078769bc.pdfIn PDF document text
    • http://files.floridatennismagazine.com/uploads/1/3/1/4/131453615/958999.pdfIn 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/1/0433/4164/3928/files/taxijejolidodusovotumabi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/8705/0390/files/64972256229.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6925/1492/files/65625858683.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/9140/9562/files/36779400373.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/5723/3576/files/metofemilarudiwozurebe.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/0175/6323/files/astro_diagnosis.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/5064/7202/files/68806927182.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/65022979336.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/0600/8216/files/97916106508.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/3015/0300/files/sobuxujebe.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/5361/2182/files/71501965998.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004a8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4A8D 5716 bytes
SHA-256: 4d460590bb647bf46f7635fbf64e8965cd0d11c953b9362f266388f00dbd12bf
font_01_sfnt_off00005e1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5E1C 9612 bytes
SHA-256: eb51ca10068f9f71277e488e844744497dbb25fc4ebc948f56ef73bdeedbf53b
font_02_sfnt_off00007f12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7F12 16580 bytes
SHA-256: c9a8c5b6694624fa826b44c4f1280818b7f86cfe7ae8d8c814ea7999857d1538

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