Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f52bee82d0da2cb…

MALICIOUS

PDF

34.4 KB Created: 2020-11-02 12:17:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 3a2c2213af985de203db66ee35785fcf SHA-1: 32e20231b28209fdd6c2157344c2c65d7b7756dd SHA-256: 4f52bee82d0da2cbe6766f024347265240cbcbf9d1b5091da5d84b6188a90824
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a large number of embedded links, many pointing to disposable hosting services, characteristic of a link farm. One of the primary links, https://cctraff.ru/strik?keyword=mesquite+isd+education+foundation, is identified as a malicious redirector, indicating a potential phishing or malware distribution attempt. The ML classifier also strongly flagged this PDF as malicious.

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://cctraff.ru/strik?keyword=mesquite+isd+education+foundation In PDF document text
    • https://tajubebejuxota.weebly.com/uploads/1/3/4/4/134477440/273d5cb6e.pdfIn PDF document text
    • https://jimigafekalese.weebly.com/uploads/1/3/1/4/131407537/lewavefupuw_vezisulub.pdfIn PDF document text
    • https://wivepeweg.weebly.com/uploads/1/3/1/4/131455463/7994676.pdfIn PDF document text
    • https://ditiwudo.weebly.com/uploads/1/3/1/4/131452947/c02036eab.pdfIn PDF document text
    • https://mitigovoponezix.weebly.com/uploads/1/3/4/3/134375948/1429637.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/1/0507/1811/3967/files/13827333415.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/652014f9-06ce-43d6-9066-aaaf4b045511/suzuxomosanobunepabumebas.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/7456/5784/files/3208503851.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0504/4666/3873/files/critical_action_gun_strike_ops_mod_apk_unlimited_money.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/5552/9640/files/toburasupawozanibuzisu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/08d33ee4-1817-447f-99f8-a00020541472/34644848618.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/1725/5581/files/happify_app_download_android.pdfIn PDF document text
    • https://s3.amazonaws.com/sezebepit/adblock_apk_download.pdfIn PDF document text
    • https://s3.amazonaws.com/kagedatabujo/hymn_to_aten_psalm_104.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/5547/1006/files/glencoe_california_mathematics_grade_6_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/subud/area_of_complex_shapes_worksheet.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_off000049d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x49D9 5020 bytes
SHA-256: 039d9be73bb226f21ade1b2664bc353cf4a7794b5e67d370e324925220d40d6f
font_01_sfnt_off00005b0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5B0E 9748 bytes
SHA-256: 9ccb9c0eccc985230862df2aed9d24ce3020ff35ec438944d0c9f4d653d703b9

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