Malicious PDF — malware analysis report

Static analysis result for SHA-256 c178551cbd8f9a58…

MALICIOUS

PDF

38.1 KB Created: 2020-10-01 20:23:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 47e3e8078cf5db4d1d251ffec0021c65 SHA-1: 61b879539650cddfd5fb1d3eb0dd3339df0782a6 SHA-256: c178551cbd8f9a58ddfee3a71d95e6b8563a7e6215f43f85b2e9e65b824eaf87
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with critical heuristics identifying it as a malicious redirector and a link farm. One of the primary links directs to a known malicious redirector, and the document body itself contains multiple URLs pointing to external PDF files, suggesting an attempt to lure users to malicious sites. The ML classifier strongly supports the 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://ggtraff.ru/strik?keyword=kabary+betsimisaraka+pdf In PDF document text
    • http://files.themusicalcamera.com/uploads/1/3/0/7/130776327/jizibof.pdfIn PDF document text
    • http://guxax.thefrancisfuneralhome.com/uploads/1/3/0/7/130738511/rojumotedur-zafijezagusi-fexiwosij-nopevokum.pdfIn PDF document text
    • http://files.instakats.com/uploads/1/3/0/8/130814680/nufaporigedete_jotim_xuvegerof.pdfIn PDF document text
    • http://nudapage.cookwithjames.com/uploads/1/3/2/6/132681192/giseb.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/1/0476/5607/5430/files/bingo_blitz_mod_apk_latest_version.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/7687/7478/files/eye_of_judgement_terraria.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3abaea19-8c3a-49d2-8f44-fc5b95a619e8/jopigubulolenopedip.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f3421e71-1199-43cc-80ef-0877d0b8407f/wezimerawinizivelu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/761498f5-bd71-4703-ad84-14768db7a900/kukiwadopuwesutiku.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/199c2843-eba3-47f6-9191-7c050751dad3/tajuxifumezikesol.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/87b546c4-143c-4658-b496-46df4c1ec23c/porutotadulilo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2eaf196a-de43-48f5-b410-d757b43dfd24/mitunonemilotu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c11d9358-fdb6-4e1d-abe9-9dc65c78c6be/64926396553.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ade0beb4-2717-4206-917d-2e3562b62d33/72708232756.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_off00005488.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5488 5432 bytes
SHA-256: 21f71d16a7c70ab4f3942861eaa8f7a3f588d00cfbf3b64780aef001f69f438d
font_01_sfnt_off000066f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x66F1 10204 bytes
SHA-256: fc4c64891c92ee2844f308f6674dbbba7352ec91788b91717b7928bbbdbd352b

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