Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ece4789cf40be9d…

MALICIOUS

PDF

48.2 KB Created: 2020-10-13 17:52:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: f209575438b5a8c3becc609b7cca64e2 SHA-1: e52aba343ed1fe988b852a6040b98f616fb0c466 SHA-256: 1ece4789cf40be9d909d265a0a78165cea43da1f639f1d92f611ae27b5534251
184 Risk Score

Malware Insights

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

This PDF document was identified as malicious due to its extensive use of embedded links, many of which point to known malicious redirectors or disposable hosting. The document body, though partially corrupted, contains text related to 'signs and symbols in physics pdf' and the authoring application 'wkhtmltopdf', suggesting a lure to disguise the malicious intent. The primary malicious URL identified is https://cctraff.ru/strik?keyword=signs+and+symbols+in+physics+pdf, which is flagged as a malicious redirector.

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=signs+and+symbols+in+physics+pdf In PDF document text
    • https://zoxuzuxebexot.weebly.com/uploads/1/3/0/9/130969059/4d5351fbb209c0.pdfIn PDF document text
    • https://gimejexoxixaza.weebly.com/uploads/1/3/1/8/131872185/4867245.pdfIn PDF document text
    • https://mojivimimujovo.weebly.com/uploads/1/3/0/8/130874437/3250b5961ed1.pdfIn PDF document text
    • https://jatorogerujew.weebly.com/uploads/1/3/2/7/132710569/movew.pdfIn PDF document text
    • https://dutitujazekap.weebly.com/uploads/1/3/0/8/130814390/4056517.pdfIn PDF document text
    • https://guwomenod.weebly.com/uploads/1/3/0/8/130873843/tiladejonu.pdfIn PDF document text
    • https://jawasolasazilem.weebly.com/uploads/1/3/1/3/131379174/wovexofek.pdfIn PDF document text
    • https://dutitujazekap.weebly.com/uploads/1/3/0/8/130814390/tunitulo.pdfIn PDF document text
    • https://gimejexoxixaza.weebly.com/uploads/1/3/1/8/131872185/nesubine.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://uploads.strikinglycdn.com/files/8fdd2d5e-7d1e-40ac-9542-df2090c556d0/81569705501.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1dd22f31-6d3c-44d6-869a-6421e1896dc3/94988336928.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/13095d05-dbd4-42ac-9738-b821d46bddf3/46993848121.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f3992b71-29cd-42d7-8aad-cc91b83b14da/50372674703.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0ed6428f-2d88-4e45-a051-d215af11a3e4/fasakenoximupinape.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0ec95209-d21e-4c72-b223-8087e3a7ba00/82547094196.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e0a25ed5-45e9-4ded-b54b-b1e886bc13e5/fivoxorozuroxen.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/77c4d656-9ce0-40f8-b9f2-045a99bab35e/89409137459.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/92d78050-1e9c-414a-b1cf-8b4b61356a19/51136996879.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/53f4b4a4-46c4-4be2-9998-1d6c000d1dc1/21714069429.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_off000070c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x70C8 5408 bytes
SHA-256: 678297fb38df30e77522434fb723c6e90530c2a2a62e914a280a3941519543d2
font_01_sfnt_off000082f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x82F1 10088 bytes
SHA-256: 18cf9f68480e82f33dcf3b554c6855bd223dcb07082ab808a85b435694e486ad
font_02_sfnt_off0000a558.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA558 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378