Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb3232494ea91368…

MALICIOUS

PDF

53.1 KB Created: 2020-11-05 07:12:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 528a23f9ed30bfe0a292397d318996e1 SHA-1: d3c8dcaba53547b1785f0386d0e11f8dd349a4ec SHA-256: bb3232494ea913689a0d15547e939caa0bcabff93e0f9b23e16660170f9196b3
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://ttraff.club/123?keyword=physics+midterm+review+answers In PDF document text
    • https://fojanatixisi.weebly.com/uploads/1/3/4/2/134265346/b2323c41a032c2.pdfIn PDF document text
    • https://guburumo.weebly.com/uploads/1/3/4/3/134322172/waxurotakobe-mazuvuru-bevoluju-wetij.pdfIn PDF document text
    • https://sozivutapadonen.weebly.com/uploads/1/3/1/1/131164462/7901005.pdfIn PDF document text
    • https://pevugubak.weebly.com/uploads/1/3/2/7/132740457/papimi-nefewekapojerof-vorur.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368225/normal_5f87a165a6ad5.pdfIn PDF document text
    • https://kuburabet.weebly.com/uploads/1/3/4/3/134362545/f8b3084193a758.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378386/normal_5f8fbd067b117.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389090/normal_5fa1981f83d06.pdfIn PDF document text
    • https://wubawujol.weebly.com/uploads/1/3/4/2/134266052/pufunaxewob.pdfIn PDF document text
    • https://bepikasubezitix.weebly.com/uploads/1/3/4/3/134325559/5eee4d.pdfIn PDF document text
    • https://tatazazotogowe.weebly.com/uploads/1/3/4/6/134618267/pubupolexugoluf_bemewup_tewavusag.pdfIn PDF document text
    • https://guwomenod.weebly.com/uploads/1/3/0/8/130873843/domovodibaposix.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://uploads.strikinglycdn.com/files/9375da5c-27a7-4009-911e-1f6168c2c3c1/47538526848.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/76984551-9be8-45b4-b097-b729298e85db/mimakazilib.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000073e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x73E1 2900 bytes
SHA-256: b3dfb2f2c41da7350fc3755141d2fd0ea5796bb125df25fec831093623ff73df
font_01_sfnt_off00007e24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7E24 5080 bytes
SHA-256: c2ed6d4e81fbea5fd7ac1a6a49c0d254cfefc31fe59bc0ef6034f32793f40bf7
font_02_sfnt_off00008f42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8F42 12304 bytes
SHA-256: 375d07d0505083789aba651ca0e5bdd7751fcfbc072e57fe31315f806e8183f8
font_03_sfnt_off0000b8de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8DE 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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