Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac95c08a0c685779…

MALICIOUS

PDF

38.7 KB Created: 2020-10-07 12:07:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 24801532affc11e0c6a2bb0b8b3e0f20 SHA-1: ed9fab2df16bb2e0a9a9f47b47ef1e40dd1f1d8a SHA-256: ac95c08a0c685779c09cb49bc45922fce96ffbd4875daabba2dbf02eee3e8323
184 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to disposable hosting and redirector infrastructure, indicating a link farm or SEO manipulation attempt. One critical heuristic identified a link to known malicious redirector infrastructure. While no scripts were extracted, the PDF structure itself facilitates the redirection, likely as a lure or to distribute further malicious content.

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://ggtraff.ru/pify?keyword=115cm+change+to+inches In PDF document text
    • http://files.myhorribleidea.com/uploads/1/3/2/8/132815004/1836057e2f.pdfIn PDF document text
    • http://burar.brushlove.ca/uploads/1/3/1/3/131398252/a1449382fdf3d.pdfIn PDF document text
    • http://files.fearless-compassion.org/uploads/1/3/1/4/131438616/3f256d7480302.pdfIn PDF document text
    • http://zunux.shansurfny.com/uploads/1/3/1/3/131379732/a52bf32.pdfIn PDF document text
    • http://dilepe.designsgee.com/uploads/1/3/2/6/132681579/801eb6585.pdfIn PDF document text
    • https://site-1036737.mozfiles.com/files/1036737/94445004787.pdfIn PDF document text
    • https://site-1037178.mozfiles.com/files/1037178/mewutegejev.pdfIn PDF document text
    • http://files.workinnvision.com/uploads/1/3/2/3/132302978/9e5b8bfe462b289.pdfIn PDF document text
    • http://files.katiebarthedoor.org/uploads/1/3/0/7/130775071/noxopovetizixokir.pdfIn PDF document text
    • http://files.couplematters.org/uploads/1/3/1/6/131606789/dutoterowu-poxuj-fakogubot-tixodef.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/1830bf51-71d7-4b20-91f4-0f342f8f5938/14677860795.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5ee320e1-4dc6-4aa1-bd06-2163f40a40aa/fexujomagudulejirazojo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f4282b84-428e-4013-adc0-a64035de978f/gujabapilivugelow.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/846d43c3-e877-4d2a-b3c4-324641ab10b2/rixitanekijugutes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b3eb4ca7-32b0-4528-a2cb-ac83bf9b7c7f/24974866370.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_off00005b2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5B2A 5164 bytes
SHA-256: 5386bad0e4d8cf65f10a43bc1577fb24e3029d45b7d719341c6a00ef7910f570
font_01_sfnt_off00006ca2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6CA2 9880 bytes
SHA-256: ade378abc4ab646730ee4fe3c7d1a53d765347031387f3a2fe90e83f72876a5e

Open this report in the interactive analyzer, or submit your own file for analysis.