Malicious PDF — malware analysis report

Static analysis result for SHA-256 607c77e220326cb6…

MALICIOUS

PDF

44.6 KB Created: 2020-10-03 10:54:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 3710dfedb164b8b799ec617c1f5d4e89 SHA-1: d2417aff71e76732286cb0e9a5dfa995953ba569 SHA-256: 607c77e220326cb630bb39786ad64c084baa3a57229eef5431f4ff302f8737c6
132 Risk Score

Malware Insights

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

The PDF contains embedded links, one of which, https://cctraff.ru/strik?keyword=spss+amos+24+free++full+version, is flagged as a malicious redirector. The document body, though heavily obfuscated, contains references to this URL and other benign-looking PDF links, suggesting a lure to download software. The ML classifier also strongly indicated maliciousness.

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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=spss+amos+24+free++full+version In PDF document text
    • https://site-1038790.mozfiles.com/files/1038790/51751487943.pdfIn PDF document text
    • https://site-1036944.mozfiles.com/files/1036944/melizogosak.pdfIn PDF document text
    • http://befago.jaegercounseling.com/uploads/1/3/2/6/132696414/8664820.pdfIn PDF document text
    • http://files.fine-scalemodela.com/uploads/1/3/1/3/131379680/dojululexapos-rakojorefupesat.pdfIn PDF document text
    • http://files.mightymustangband.com/uploads/1/3/0/7/130738623/806997.pdfIn PDF document text
    • http://datag.memphisescaperooms.com/uploads/1/3/1/1/131164392/lumotosok_visudepe.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/1/0501/0957/9429/files/68923712645.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/3021/6345/files/northern_hills_elementary_onalaska.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/0971/7910/files/bafotimutolufopanedazejav.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/21ca7bf0-858d-426a-9955-c10347619df8/99816897512.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a4285718-933a-4363-af8b-1445b4766b0e/bepokejuwamuxiloku.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b3867804-d35a-406c-8b11-e69084a427bb/kejazanesiti.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/17410eb3-35e9-4a3c-bc05-ab38012947ab/dotusofabiruxozovizoluk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3e01dbe2-164c-4552-9ed0-cdb48692b7cd/12846917226.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_off00006089.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6089 5232 bytes
SHA-256: b8f7d72fdc7ccebcdc4ff99d425ddd3608ae4b3d48f48573eac25aa833d27306
font_01_sfnt_off0000723e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x723E 10500 bytes
SHA-256: 843101bbc7e7408201cf06b9e1c6ffa4a678c5e24042caf6399fe185d3be7e7f
font_02_sfnt_off00009626.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9626 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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