Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab384e08a7f2560c…

MALICIOUS

PDF

50.0 KB Created: 2020-10-01 01:52:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 7fb3e911984f450efc23c33df2cfc22b SHA-1: d3a83562ae2898ed2f507d34ff5151c9a0cad6ea SHA-256: ab384e08a7f2560c68b13f33da2e7803dab2760cf1872f5d8dfbc8be60feadeb
124 Risk Score

Malware Insights

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

The PDF file contains embedded URLs, one of which, 'https://cctraff.ru/strik?keyword=libro+para+aprender+a+tocar+guitarra+pdf', is flagged as a malicious redirector. The document body, though heavily obfuscated, appears to contain this URL and other benign Shopify links, suggesting a lure to a malicious site disguised as a search result. The ML classifier strongly indicates maliciousness, and the PDF structure is consistent with link farm abuse.

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 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=libro+para+aprender+a+tocar+guitarra+pdf In PDF document text
    • https://site-1038506.mozfiles.com/files/1038506/36224652906.pdfIn PDF document text
    • https://site-1037237.mozfiles.com/files/1037237/mivifewazubimemofon.pdfIn PDF document text
    • https://site-1038331.mozfiles.com/files/1038331/76462329325.pdfIn PDF document text
    • https://site-1038612.mozfiles.com/files/1038612/gesefivelala.pdfIn PDF document text
    • https://site-1037152.mozfiles.com/files/1037152/51140717337.pdfIn PDF document text
    • http://kogipisap.kristysinsara.org/uploads/1/3/0/7/130775934/4240591.pdfIn PDF document text
    • http://lixejuji.keithgreenough.com/uploads/1/3/0/7/130738568/juwixofe.pdfIn PDF document text
    • http://nubuz.desertblossomshop.com/uploads/1/3/2/3/132302842/mugotatekegored.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/1/0437/0428/7383/files/steps_in_personal_selling_process.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/5522/5763/files/labeling_a_human_cell_worksheet.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/3206/7748/files/empire_earth_cdkey.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/0660/5987/files/74061187281.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b0de55ed-e27e-4284-a3eb-bc29cc76a4a7/93935623231.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/347ea7e8-7cbf-4822-90a4-a6b538b07482/binojidupubupofuwerilazas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/62013ec3-2b3e-4988-9a68-d46896def086/dowuvuxug.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/99420050-885f-4d69-b309-5f3e2e1dc8f5/91935999397.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3534835a-5467-49d1-9903-0fc528e516e6/14952416718.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_off00006cc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6CC8 5196 bytes
SHA-256: 9d7ec8cf821d37cefe48d4fd49bb1942ef786f944d30204bf4d5532a3b6c1db8
font_01_sfnt_off00007e85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7E85 11212 bytes
SHA-256: be500c1be5083c8049b3646755b07619634cbf0f273aa0e7e005aab0662fc4af
font_02_sfnt_off0000a313.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA313 16204 bytes
SHA-256: a95eff378c135b1ab40d10b3cd1da1bafbc07f86005f57898d079c90d712ddbd

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