Malicious PDF — malware analysis report

Static analysis result for SHA-256 421445af7f5c6354…

MALICIOUS

PDF

51.1 KB Created: 2020-10-08 17:39:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: e59e77d05cb1729f9239e564e3a32744 SHA-1: ee058c2bd7c6b23551d821e6f775043cbd652840 SHA-256: 421445af7f5c635415658f52cf667ca1f80da5439d1ea55abec49b9629b77095
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains a large number of external links, many of which point to disposable hosting or known malicious redirectors. The primary malicious link identified is https://ggtraff.ru/strik?keyword=dna+structure+and+function+worksheet+ap+biology+answer+key, which is flagged as a malicious redirector. This suggests the document is designed to lure users to malicious sites, likely for further exploitation or phishing.

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://ggtraff.ru/strik?keyword=dna+structure+and+function+worksheet+ap+biology+answer+key In PDF document text
    • https://site-1042780.mozfiles.com/files/1042780/42143085772.pdfIn PDF document text
    • https://site-1043408.mozfiles.com/files/1043408/72205605532.pdfIn PDF document text
    • https://site-1040427.mozfiles.com/files/1040427/91726877992.pdfIn PDF document text
    • https://site-1039257.mozfiles.com/files/1039257/58991115504.pdfIn PDF document text
    • http://gumiwoto.goingtobet.com/uploads/1/3/0/7/130740444/sivowasubobajugizep.pdfIn PDF document text
    • http://files.hartosteopathy.com/uploads/1/3/0/7/130775519/98da153.pdfIn PDF document text
    • http://files.classedemonsieurhugo.com/uploads/1/3/1/4/131452903/bac2e85083287c.pdfIn PDF document text
    • http://vadipudu.shopbellerebelle.com/uploads/1/3/0/9/130969423/fivewomofosevuf-labineka-zudamopise.pdfIn PDF document text
    • http://files.souderlandscaping.com/uploads/1/3/0/7/130775354/4886970.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/1/0478/8348/5350/files/san_juan_schoology.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/6554/3329/files/zedatovapiwik.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/0465/7315/files/thomas_dale_high_school_demographics.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007a69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7A69 5696 bytes
SHA-256: b9a9137c8d0fee150c6fbc58d4bcc2148626abb7c871da3ea9700cb2440deea9
font_01_sfnt_off00008dde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8DDE 10280 bytes
SHA-256: eaf9d13c7752658dc1607bdc2db07283bb218d2b51028b0de776aeacb03fec8b
font_02_sfnt_off0000b106.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB106 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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