Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b05bc4c4cb5b716…

MALICIOUS

PDF

74.8 KB Created: 2020-11-07 17:18:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 5916bfb04f970f9524fbb9652ecece9e SHA-1: 587d1b08b26ad4ed8b9cd895b87e00831058d1ed SHA-256: 4b05bc4c4cb5b7161a56641694002003fe1e59dd6a59e738f1dfbbfb3b69573a
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains embedded links that redirect to a known malicious domain, traffking.ru. Heuristics indicate this is a redirector link and part of a link farm on disposable hosting. The ML classifier also flagged this PDF as malicious with high confidence. The embedded URL is the primary indicator of malicious intent, likely serving as a lure for further compromise.

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://traffking.ru/wb?keyword=ionic%20hydrate%20worksheet%20answers In PDF document text
    • https://cdn-cms.f-static.net/uploads/4367668/normal_5f8e64a33f3ea.pdfIn PDF document text
    • https://wefamojugibe.weebly.com/uploads/1/3/1/1/131164519/6796784.pdfIn PDF document text
    • https://fofafobef.weebly.com/uploads/1/3/4/3/134349457/pipuzojok_lexogibafiwa_lorifukeno_bijirek.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381964/normal_5f95493ddfc6a.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/d4d0b2fc-1dbc-4950-a2ac-c4bd42eb59da/17267548368.pdfIn PDF document text
    • https://s3.amazonaws.com/nuxepiduded/35331581685.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7e399a65-0348-4a35-8fed-d5d290df70df/beiimaan_love_720p_bluray.pdfIn PDF document text
    • https://sisiviweze.files.wordpress.com/2020/11/goresosuvufat.pdfIn PDF document text
    • https://sugufafud.files.wordpress.com/2020/11/jovejoloko.pdfIn PDF document text
    • https://mefutaveve.files.wordpress.com/2020/11/gaspar_noe_love_movie_watch_online.pdfIn PDF document text
    • https://tesuserowin.files.wordpress.com/2020/11/assam_tet_free_guide_book.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_off0000e9b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9B0 5188 bytes
SHA-256: 7f1f83816dfb555517a566ac2f15bb2fb280e18e139a064db5b3561212c5d075
font_01_sfnt_off0000fb64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB64 10688 bytes
SHA-256: 58c8ad5310ac285dbc7fc5bab92ce366502fee8117defdae17bce0bc37685cf8

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