Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3ce732f9c1760f6…

MALICIOUS

PDF

41.7 KB Created: 2020-10-09 03:30:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: b1bfa056217a7403cbb7c31ce8533ad7 SHA-1: 1647a7f40ecb8ba1d005eb7c0493f4be4ccc7ebc SHA-256: a3ce732f9c1760f6be0841fa2ddeab09c28ec9d5b2cb348acb7d730328d6f2a1
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded links pointing to external PDF files hosted on various disposable domains, indicating a link farm or SEO manipulation scheme. One of the primary links directs to a known malicious redirector, suggesting a potential distribution vector for further malicious content. 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 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://gettraff.ru/pify?keyword=unit+7+vocab+answers+level+e In PDF document text
    • https://site-1036713.mozfiles.com/files/1036713/69042976845.pdfIn PDF document text
    • https://site-1036925.mozfiles.com/files/1036925/65823670944.pdfIn PDF document text
    • https://site-1037221.mozfiles.com/files/1037221/39565824492.pdfIn PDF document text
    • http://files.fyidanceclub.com/uploads/1/3/0/8/130874284/f3a01be41b2.pdfIn PDF document text
    • http://files.minedlandrehab.com.au/uploads/1/3/1/6/131637226/539772.pdfIn PDF document text
    • http://bewowum.ab-intercultural.com/uploads/1/3/0/8/130874329/4d5d1a875a1e5.pdfIn PDF document text
    • http://neneb.mydmcihomes.com/uploads/1/3/1/3/131398222/zupozirarimo-tamekufezaz-mowupoko.pdfIn PDF document text
    • http://files.techtalkmercy.com/uploads/1/3/1/8/131857523/gulamuwegidukonara.pdfIn PDF document text
    • http://files.nickgatesart.com/uploads/1/3/1/3/131398431/zomelafaze.pdfIn PDF document text
    • http://felod.mowerok.com/uploads/1/3/1/4/131482952/tefoxefi-vumuteju.pdfIn PDF document text
    • http://files.krugerconstruction.net/uploads/1/3/1/8/131871462/dofimuwuzuf.pdfIn PDF document text
    • http://files.carolynhasley.com/uploads/1/3/2/7/132741194/58dac67f3782.pdfIn PDF document text
    • http://files.gethsemanedavenport.org/uploads/1/3/1/3/131380343/c784618ec263a9.pdfIn PDF document text
    • http://files.jenniedemelloesouza.com/uploads/1/3/2/7/132740649/407053.pdfIn PDF document text
    • http://files.louisewknight.com/uploads/1/3/1/8/131856339/xegubulob.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
    • 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_off00005956.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5956 4944 bytes
SHA-256: 83d2e98ef9168f59dcaf8aa9f27ffd873440a6a68e71f0d146b449d5d41c81c0
font_01_sfnt_off00006a43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6A43 9896 bytes
SHA-256: 4f02726d1ff76b12c231e265e1f9814e933fc8310c23c77e2aa1c0227c395f59
font_02_sfnt_off00008c09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8C09 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3