Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4726b528457a081…

MALICIOUS

PDF

38.5 KB Created: 2020-10-08 21:20:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 75df2a1343299e3937578c3aab0204ba SHA-1: e19380f84ae0b3551cf5ee61836b507ebc9729ee SHA-256: d4726b528457a081613cc50ec92d5aa11c43b679c02c1b552212254709078d68
124 Risk Score

Malware Insights

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

The PDF contains embedded URLs that redirect to malicious infrastructure, as indicated by the 'PDF_MALICIOUS_REDIRECTOR_LINK' heuristic. The document body, though heavily obfuscated, contains text suggesting a lure for a 'free download'. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is designed to trick users into visiting a malicious site. No scripts were extracted, but the presence of multiple links and the redirector heuristic point to a phishing or malware distribution attempt.

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=secret+unsealed+free+download In PDF document text
    • https://site-1040050.mozfiles.com/files/1040050/juxodefilulesebuda.pdfIn PDF document text
    • https://site-1040299.mozfiles.com/files/1040299/94469544957.pdfIn PDF document text
    • https://site-1036852.mozfiles.com/files/1036852/67940196118.pdfIn PDF document text
    • https://site-1037142.mozfiles.com/files/1037142/77471361162.pdfIn PDF document text
    • https://site-1036977.mozfiles.com/files/1036977/32809497920.pdfIn PDF document text
    • http://nirufazib.marktobin.com/uploads/1/3/0/8/130814070/5565218.pdfIn PDF document text
    • http://files.sinandsatin.com/uploads/1/3/1/3/131379421/lebozanema_gulajoka_jurajili_kuwuwunuxefusi.pdfIn PDF document text
    • https://site-1037102.mozfiles.com/files/1037102/72394525225.pdfIn PDF document text
    • https://site-1038552.mozfiles.com/files/1038552/xorijuwokuvobazilife.pdfIn PDF document text
    • https://site-1042266.mozfiles.com/files/1042266/69314809465.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/9836/5340/files/making_predictions_worksheet_3_answer_key.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/0459/4845/files/baby_boy_quilt_patterns_for_beginners.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_off000058bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x58BB 5212 bytes
SHA-256: fa2baa78655f602f1ebf365001690cd81eeb22452c748beee352087a3785dd09
font_01_sfnt_off00006a93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6A93 10280 bytes
SHA-256: 3cece9976b5ab4d404b575475eafa94365bb72cbfe7c416a5486f5cbdd3095b5

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