Malicious PDF — malware analysis report

Static analysis result for SHA-256 0461fae2479ba480…

MALICIOUS

PDF

40.5 KB Created: 2020-10-10 11:26:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 4f240e4862e58844dacd144c3b154ef3 SHA-1: 516a33e162a368edb96dd39d75ca098b623e3e7f SHA-256: 0461fae2479ba480ae4b2c2887431d615c917b511ba367cabea34d36d03e9e9d
124 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body text and extracted URLs suggest a lure to download an application. The ML classifier also strongly flagged this PDF as malicious, supporting the assessment of a malicious redirector pattern.

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 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://ttraff.link/pify?keyword=download+text+plus+apk In PDF document text
    • https://site-1038600.mozfiles.com/files/1038600/pekufad.pdfIn PDF document text
    • https://site-1041615.mozfiles.com/files/1041615/99441437047.pdfIn PDF document text
    • https://site-1042551.mozfiles.com/files/1042551/78878072451.pdfIn PDF document text
    • https://site-1036910.mozfiles.com/files/1036910/78486676677.pdfIn PDF document text
    • https://site-1048208.mozfiles.com/files/1048208/vugavowexasewufoke.pdfIn PDF document text
    • http://rivuf.warungfalafelbali.com/uploads/1/3/0/9/130968996/digazazev_mofilozobuje.pdfIn PDF document text
    • http://mobisada.mounthollywood.org/uploads/1/3/2/6/132695832/6483034.pdfIn PDF document text
    • http://pisikige.makingpeacelast.com/uploads/1/3/0/8/130814229/jofuzirikenawejuvote.pdfIn PDF document text
    • http://files.jablacrosse.com/uploads/1/3/0/9/130969130/7567576.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/a9787a81-dd73-4b98-83a7-2117e1611b1a/borom.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0d46d3d9-3a08-43c7-968b-8a05ffad1d35/44024567679.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_off0000514e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x514E 4916 bytes
SHA-256: f0cb123851438c44bcf0e03f6e10671f0c45f4a83163732311dafefef0a6a069
font_01_sfnt_off0000622f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x622F 11092 bytes
SHA-256: dd85e2b760410b0130e82ea15c98067a7297069269b231134585db9e15582acb
font_02_sfnt_off000087cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x87CF 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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