Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9efccb87db2fd72…

MALICIOUS

PDF

42.2 KB Created: 2020-10-07 13:35:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 202d27b9aab81a44c9e7865f58e1a4a4 SHA-1: d3bad98091e07843cdaa652ea412800682473e04 SHA-256: f9efccb87db2fd72974618efe969c9cb8edd0b23e1fb0fd01f184cc5492c1440
124 Risk Score

Malware Insights

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

This PDF file contains multiple embedded URLs, with one identified as a known malicious redirector. The document body, though obfuscated, contains references to these URLs, suggesting an attempt to lure users to malicious sites. The ML classifier strongly flagged this PDF as malicious, indicating a high probability of malicious intent.

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://ggtraff.ru/pify?keyword=deductive+reasoning+worksheet+phil+347 In PDF document text
    • http://files.murphybocce.com/uploads/1/3/2/6/132695569/8b9557c431721.pdfIn PDF document text
    • http://files.southpacifichydroponics.com/uploads/1/3/0/7/130775980/474686.pdfIn PDF document text
    • http://files.northalabamadt.com/uploads/1/3/1/6/131636807/3374ef.pdfIn PDF document text
    • http://files.freshairfitness.net/uploads/1/3/1/1/131163729/fotikufifokuf.pdfIn PDF document text
    • http://getiwi.comfycabinfamily.com/uploads/1/3/1/6/131637136/6c0008c4887a4.pdfIn PDF document text
    • http://files.doggroomingventura.com/uploads/1/3/1/3/131380083/9656638.pdfIn PDF document text
    • http://bakusil.fluxpilatesandwellness.com/uploads/1/3/1/4/131406403/696a00d98f9.pdfIn PDF document text
    • http://files.peonyandperidot.com/uploads/1/3/0/7/130776183/zomodelifepowopiped.pdfIn PDF document text
    • http://files.misswaggaquest.com/uploads/1/3/2/6/132680903/vedotudupavofinonama.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/c5778784-e213-4c77-ac04-b0a29f01aaae/rurejikajiwilinafatixel.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6d4415dd-8fb1-4c7a-b447-74400030f8b5/wodovo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/03324ede-0b56-4f18-9ecc-3a8f52fb6d99/bakevutorob.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2a223b6a-b01f-4f27-ae72-38aea701c71b/85719433630.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bf9332b1-41b2-474f-b040-396b3c2b6117/98218530378.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_off00006475.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6475 5880 bytes
SHA-256: a79cf026f1d9f341a4260210a9e9c217385723e9b262966a99ab5d1f00bc8391
font_01_sfnt_off000078a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x78A2 10424 bytes
SHA-256: 5546f71918e1c39efcb88f28b648d3fcb18ea132a350769ba92e0bdcb9ed5387

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