Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ac9d2d05f91d87f…

MALICIOUS

PDF

45.6 KB Created: 2020-10-03 01:43:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 07d59be45d83f0ff0533b0718ae5fe36 SHA-1: fe4dd577993026b094a88afd88626ee4284f9773 SHA-256: 8ac9d2d05f91d87f76ea001981f8f5dd3f881b4edf255c957347096172ef196b
124 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with one specifically identified as a malicious redirector. The ML classifier strongly flagged this PDF as malicious. The presence of numerous links, including those on disposable hosting, suggests an attempt to lure users to malicious infrastructure, likely for phishing or malware distribution.

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://cctraff.ru/strik?keyword=balladen+klasse+7+%25C3%25BCbungen+pdf In PDF document text
    • http://zigowu.abdullah-francis.com/uploads/1/3/1/8/131857114/diwukaxe.pdfIn PDF document text
    • https://site-1038884.mozfiles.com/files/1038884/93553829388.pdfIn PDF document text
    • https://site-1040424.mozfiles.com/files/1040424/69225933650.pdfIn PDF document text
    • https://site-1037222.mozfiles.com/files/1037222/35608933738.pdfIn PDF document text
    • https://site-1036786.mozfiles.com/files/1036786/94127568832.pdfIn PDF document text
    • https://site-1037122.mozfiles.com/files/1037122/tizapeli.pdfIn PDF document text
    • https://site-1039877.mozfiles.com/files/1039877/gakolofi.pdfIn PDF document text
    • https://site-1036625.mozfiles.com/files/1036625/20141342243.pdfIn PDF document text
    • https://site-1038332.mozfiles.com/files/1038332/14512333819.pdfIn PDF document text
    • https://site-1038771.mozfiles.com/files/1038771/luravuladizumukazoma.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://cdn.shopify.com/s/files/1/0481/3927/2355/files/forikususetikefurufadamav.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/4053/0854/files/ironwood_cancer_center_arbor.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/0645/2131/files/tozogizoporapafewusat.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0478/1041/2703/files/lamul.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_off000063aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x63AA 5208 bytes
SHA-256: e61392f1b750604870a5b11ef3c85b9f49a0ac16595fd6f8e25f477349e74923
font_01_sfnt_off0000753a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x753A 10948 bytes
SHA-256: 6e65eeac619c1b3461c4c2806797085c647c230ac9ff71560b6c4914d072638b
font_02_sfnt_off0000993b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x993B 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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