Malicious PDF — malware analysis report

Static analysis result for SHA-256 62dafc6a4aebe53c…

MALICIOUS

PDF

74.0 KB Created: 2021-01-18 07:54:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: c9f2b10292ab691889121feabd939118 SHA-1: f5a8f461824525df3400dc0d9c8b2e588103ffe3 SHA-256: 62dafc6a4aebe53c3cad7b0b597e9c5d5473191f4026a98bbed3e6cd27d999bf
124 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to known malicious infrastructure, specifically `https://traffine.ru/aws?utm_term=all+tamil+hd+movies++app`. The document body, though heavily obfuscated, also contains this URL, suggesting an attempt to lure users to potentially harmful content. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious redirector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://traffine.ru/aws?utm_term=all+tamil+hd+movies++app In PDF document text
    • https://cdn-cms.f-static.net/uploads/4456667/normal_5fa2e0cf270c4.pdfIn PDF document text
    • https://site-1200261.mozfiles.com/files/1200261/gefosopowoposamudakovusej.pdfIn PDF document text
    • https://site-1248249.mozfiles.com/files/1248249/najunozaranabuvekinam.pdfIn PDF document text
    • https://site-1201147.mozfiles.com/files/1201147/bilal_khan_khamoshi.pdfIn PDF document text
    • https://site-1200530.mozfiles.com/files/1200530/92053486429.pdfIn PDF document text
    • https://site-1178426.mozfiles.com/files/1178426/23111946931.pdfIn PDF document text
    • https://site-1175521.mozfiles.com/files/1175521/gominiwi.pdfIn PDF document text
    • https://site-1176532.mozfiles.com/files/1176532/32333311269.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369313/normal_5f8db523bea6f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420459/normal_5fecef5dce662.pdfIn PDF document text
    • https://site-1189425.mozfiles.com/files/1189425/38193590397.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367283/normal_5f9cc18a4d062.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450734/normal_5fadd8222c6f0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sogigadataga.epizy.com/peligonogugez.pdfIn PDF document text
    • http://valamujunitun.epizy.com/nih_template_biosketch.pdfIn PDF document text
    • http://xifetofaramil.rf.gd/silk_bed_sheets_sale.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_off0000e29b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE29B 5152 bytes
SHA-256: 9cf32599ff2c6d0e1f63777e3be30ec1f5ad7baa567686c96e31517937c4493d
font_01_sfnt_off0000f402.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF402 10896 bytes
SHA-256: 76e14a361df9748b19626cf123758e2790434253dfc35d150c905f60d8cfdf31

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